понедельник, 16 ноября 2020 г.

7 amazing technologies we'll see by 2030

 


Top technologies: 1 #AI 2 #IoT 3 #blockchain 4 #3Dprinting 5 #SelfDrivingCars 6 #Robotics 7 #VR/#AR 8 #QuantumComputing 9 #5G 10 #cybersecurity




I-VISION Stunning Apple Glass concept shows headset that puts a computer on your EYES

 

Designer Iskander Utebayev has mocked up designs for a possible Apple Glass productCredit: Iskander Utebayev



A FUTURISTIC "Apple Glass" headset could totally replace your iPhone – by giving you augmented reality cyber-vision.

Amazing concept footage of the rumoured headset has been mocked up by a skilled designer, giving us a glimpse of our sci-fi futures.

Apple has been expected to release "smart specs" that let you see computer-generated images for years.

And some insiders have suggested the tech may be launching soon.

Now designer Iskander Utebayev has mocked up concept designs showing off what the headset might look like.

The genius system lets you see apps and games – and even a virtual keyboard – all floating in the air in front of you.



Very cool augmented reality glasses concept by Iskander Utebayev. Would you wear these?

You can reach out and touch these virtual screens, just like in sci-fi film Minority Report.

The long-rumoured Apple Glass specs are reportedly designed to overlay computer-generated images onto the real world around you.

Augmented reality is when virtual images are placed on top of real-world views.

A simple example is a Snapchat filter, or the Pokémon Go game.

Putting AR inside a pair of spectacles could be the next step in portable computing, potentially replacing the smartphone.

Earlier this year, respected industry analyst and leaker Jon Prosser says that these devices are going to be called Apple Glass.

And they're said to retail for $499 – which is about £410 in the UK, though £499 seems likelier.

Speaking on his Front Page Tech show on YouTube, Prosser said that prescription lenses will be available for an additional cost.

And he says that they could be announced as soon as September, alongside the iPhone 12.

You could replace your iPhone or MacBook with a pair of Apple Glass specsCredit: Iskander Utebayev

However, he also thinks it's more likely that the Apple Glass will be announced in March 2021 – if social distancing is still in place for September.

In any case, the Apple Glass headset isn't expected to land in stores until the final quarter of 2021.

Prosser previously claimed that the Apple Glass will be 5G-ready.

That means they'll reportedly be capable of supporting the ultra-fast internet speeds offered by new 5G networks.

Constantly scanning the environment and adding sophisticated CGI onto the real-world could require very fast internet speeds – which would justify the addition of 5G.

It would also mean that the glasses would be capable of being used even when apart from a paired iPhone.

The Apple Glasses are expected to look like traditional spectacles, which would be a contrast to bulky AR and VR headsets we've seen previously.

Apple has invested a lot in virtual tech in recent years, crafting handing out tools for creating AR and VR tools such as ARKit and RealityKit, as well as creative tools like Reality Composer and Reality Converter.

It's also loaded a LiDAR Scanner - used for AR and VR tools - onto the new iPad Pro, and will likely do the same for its upcoming iPhones.

Apple hasn't confirmed plans to debut any smart glasses just yet, but it's likely that the tech giant is working on such a device.

Apple Glass could be the next stage of personal computingCredit: Iskander Utebayev

Most of its competitors have already dabbled in virtual reality and augmented reality, including Google, Microsoft, Facebook, Samsung, LG, and HTC.

Previous reports have suggested the new device uses a "catadioptric system" that uses curved mirrors and lenses to combine refraction and reflection.

This means that Apple could ditch the magnifying lenses you find in most traditional VR headsets, potentially reducing the overall weight.

In a patent that surfaced on the web last year, Apple admitted that current virtual reality and augmented reality headsets are too heavy.

"If care is not taken, a head-mounted display may be cumbersome and tiring to wear," the firm said. "Extended use of a head-mounted display with this type of optical system may be uncomfortable."


https://bit.ly/3pzw2E3



Fixed vs. Growth: The Two Basic Mindsets That Shape Our Lives

 

How to fine-tune the internal monologue that scores every aspect of our lives, from leadership to love.


“If you imagine less, less will be what you undoubtedly deserve,” Debbie Millman counseled in one of the best commencement speeches ever given, urging: “Do what you love, and don’t stop until you get what you love. Work as hard as you can, imagine immensities…” Far from Pollyanna platitude, this advice actually reflects what modern psychology knows about how belief systems about our own abilities and potential fuel our behavior and predict our success. Much of that understanding stems from the work of Stanford psychologist Carol Dweck, synthesized in her remarkably insightful Mindset: The New Psychology of Success (public library) — an inquiry into the power of our beliefs, both conscious and unconscious, and how changing even the simplest of them can have profound impact on nearly every aspect of our lives.

One of the most basic beliefs we carry about ourselves, Dweck found in her research, has to do with how we view and inhabit what we consider to be our personality. A “fixed mindset” assumes that our character, intelligence, and creative ability are static givens which we can’t change in any meaningful way, and success is the affirmation of that inherent intelligence, an assessment of how those givens measure up against an equally fixed standard; striving for success and avoiding failure at all costs become a way of maintaining the sense of being smart or skilled. A “growth mindset,” on the other hand, thrives on challenge and sees failure not as evidence of unintelligence but as a heartening springboard for growth and for stretching our existing abilities. Out of these two mindsets, which we manifest from a very early age, springs a great deal of our behavior, our relationship with success and failure in both professional and personal contexts, and ultimately our capacity for happiness.



The consequences of believing that intelligence and personality can be developed rather than being immutably engrained traits, Dweck found in her two decades of research with both children and adults, are remarkable. She writes:

For twenty years, my research has shown that the view you adopt for yourself profoundly affects the way you lead your life. It can determine whether you become the person you want to be and whether you accomplish the things you value. How does this happen? How can a simple belief have the power to transform your psychology and, as a result, your life?

Believing that your qualities are carved in stone — the fixed mindset — creates an urgency to prove yourself over and over. If you have only a certain amount of intelligence, a certain personality, and a certain moral character — well, then you’d better prove that you have a healthy dose of them. It simply wouldn’t do to look or feel deficient in these most basic characteristics.

[…]

I’ve seen so many people with this one consuming goal of proving themselves — in the classroom, in their careers, and in their relationships. Every situation calls for a confirmation of their intelligence, personality, or character. Every situation is evaluated: Will I succeed or fail? Will I look smart or dumb? Will I be accepted or rejected? Will I feel like a winner or a loser? . . .

There’s another mindset in which these traits are not simply a hand you’re dealt and have to live with, always trying to convince yourself and others that you have a royal flush when you’re secretly worried it’s a pair of tens. In this mindset, the hand you’re dealt is just the starting point for development. This growth mindset is based on the belief that your basic qualities are things you can cultivate through your efforts. Although people may differ in every which way — in their initial talents and aptitudes, interests, or temperaments — everyone can change and grow through application and experience.

Do people with this mindset believe that anyone can be anything, that anyone with proper motivation or education can become Einstein or Beethoven? No, but they believe that a person’s true potential is unknown (and unknowable); that it’s impossible to foresee what can be accomplished with years of passion, toil, and training.

At the heart of what makes the “growth mindset” so winsome, Dweck found, is that it creates a passion for learning rather than a hunger for approval. Its hallmark is the conviction that human qualities like intelligence and creativity, and even relational capacities like love and friendship, can be cultivated through effort and deliberate practice. Not only are people with this mindset not discouraged by failure, but they don’t actually see themselves as failing in those situations — they see themselves as learning. Dweck writes:

Why waste time proving over and over how great you are, when you could be getting better? Why hide deficiencies instead of overcoming them? Why look for friends or partners who will just shore up your self-esteem instead of ones who will also challenge you to grow? And why seek out the tried and true, instead of experiences that will stretch you? The passion for stretching yourself and sticking to it, even (or especially) when it’s not going well, is the hallmark of the growth mindset. This is the mindset that allows people to thrive during some of the most challenging times in their lives.

This idea, of course, isn’t new — if anything, it’s the fodder of self-help books and vacant “You can do anything!” platitudes. What makes Dweck’s work different, however, is that it is rooted in rigorous research on how the mind — especially the developing mind — works, identifying not only the core drivers of those mindsets but also how they can be reprogrammed.

Dweck and her team found that people with the fixed mindset see risk and effort as potential giveaways of their inadequacies, revealing that they come up short in some way. But the relationship between mindset and effort is a two-way street:

It’s not just that some people happen to recognize the value of challenging themselves and the importance of effort. Our research has shown that this comes directly from the growth mindset. When we teach people the growth mindset, with its focus on development, these ideas about challenge and effort follow. . . .

As you begin to understand the fixed and growth mindsets, you will see exactly how one thing leads to another—how a belief that your qualities are carved in stone leads to a host of thoughts and actions, and how a belief that your qualities can be cultivated leads to a host of different thoughts and actions, taking you down an entirely different road.

[…]

The mindsets change what people strive for and what they see as success. . . they change the definition, significance, and impact of failure. . . they change the deepest meaning of effort.

Dweck cites a poll of 143 creativity researchers, who concurred that the number-one trait underpinning creative achievement is precisely the kind of resilience and fail-forward perseverance attributed to the growth mindset. She writes:

When you enter a mindset, you enter a new world. In one world — the world of fixed traits — success is about proving you’re smart or talented. Validating yourself. In the other — the world of changing qualities — it’s about stretching yourself to learn something new. Developing yourself.

In one world, failure is about having a setback. Getting a bad grade. Losing a tournament. Getting fired. Getting rejected. It means you’re not smart or talented. In the other world, failure is about not growing. Not reaching for the things you value. It means you’re not fulfilling your potential.

In one world, effort is a bad thing. It, like failure, means you’re not smart or talented. If you were, you wouldn’t need effort. In the other world, effort is what makes you smart or talented.


But her most remarkable research, which has informed present theories of why presence is more important than praise in teaching children to cultivate a healthy relationship with achievement, explores how these mindsets are born — they form, it turns out, very early in life. In one seminal study, Dweck and her colleagues offered four-year-olds a choice: They could either redo an easy jigsaw puzzle, or try a harder one. Even these young children conformed to the characteristics of one of the two mindsets — those with “fixed” mentality stayed on the safe side, choosing the easier puzzles that would affirm their existing ability, articulating to the researchers their belief that smart kids don’t make mistakes; those with the “growth” mindset thought it an odd choice to begin with, perplexed why anyone would want to do the same puzzle over and over if they aren’t learning anything new. In other words, the fixed-mindset kids wanted to make sure they succeeded in order to seem smart, whereas the growth-mindset ones wanted to stretch themselves, for their definition of success was about becoming smarter.


Dweck quotes one seventh-grade girl, who captured the difference beautifully:

I think intelligence is something you have to work for … it isn’t just given to you.… Most kids, if they’re not sure of an answer, will not raise their hand to answer the question. But what I usually do is raise my hand, because if I’m wrong, then my mistake will be corrected. Or I will raise my hand and say, ‘How would this be solved?’ or ‘I don’t get this. Can you help me?’ Just by doing that I’m increasing my intelligence.

Things got even more interesting when Dweck brought people into Columbia’s brain-wave lab to study how their brains behaved as they answered difficult questions and received feedback. What she found was that those with a fixed mindset were only interested in hearing feedback that reflected directly on their present ability, but tuned out information that could help them learn and improve. They even showed no interest in hearing the right answer when they had gotten a question wrong, because they had already filed it away in the failure category. Those with a growth mindset, on the other hand, were keenly attentive to information that could help them expand their existing knowledge and skill, regardless of whether they’d gotten the question right or wrong — in other words, their priority was learning, not the binary trap of success and failure.


hed students right into the fixed mindset, and they showed all the signs of it, too: When we gave them a choice, they rejected a challenging new task that they could learn from. They didn’t want to do anything that could expose their flaws and call into question their talent.

[…]

In contrast, when students were praised for effort, 90 percent of them wanted the challenging new task that they could learn from.


The most interesting part, however, is what happened next: Dweck and her colleagues gave the students a subsequent set of harder problems, on which the students didn’t do so well. Suddenly, the ability-praised kids thought they weren’t so smart or gifted after all. Dweck puts it poignantly:

If success had meant they were intelligent, then less-than-success meant they were deficient.

But for the effort-praised kids, the difficulty was simply an indication that they had to put in more effort, not a sign of failure or a reflection of their poor intellect. Perhaps most importantly, the two mindsets also impacted the kids’ level of enjoyment — everyone enjoyed the first round of easier questions, which most kids got right, but as soon as the questions got more challenging, the ability-praised kids no longer had any fun, while the effort-praised ones not only still enjoyed the problems but even said that the more challenging, the more fun. The latter also had significant improvements in their performance as the problems got harder, while the former kept getting worse and worse, as if discouraged by their own success-or-failure mindset.

It gets better — or worse, depending on how we look at it: The most unsettling finding came after the IQ questions were completed, when the researchers asked the kids to write private letters to their peers relaying the experience, including a space for reporting their scores on the problems. To Dweck’s devastation, the most toxic byproduct of the fixed mindset turned out to be dishonesty: Forty percent of the ability-praised kids lied about their scores, inflating them to look more successful. She laments:

In the fixed mindset, imperfections are shameful — especially if you’re talented — so they lied them away. What’s so alarming is that we took ordinary children and made them into liars, simply by telling them they were smart.

This illustrates the key difference between the two mindsets — for those with a growth one, “personal success is when you work your hardest to become your best,” whereas for those with a fixed one, “success is about establishing their superiority, pure and simple. Being that somebody who is worthier than the nobodies.” For the latter, setbacks are a sentence and a label. For the former, they’re motivating, informative input — a wakeup call.


But one of the most profound applications of this insight has to do not with business or education but with love. Dweck found that people exhibited the same dichotomy of dispositions in their personal relationships: Those with a fixed mindset believed their ideal mate would put them on a pedestal and make them feel perfect, like “the god of a one-person religion,” whereas those with the growth mindset preferred a partner who would recognize their faults and lovingly help improve them, someone who would encourage them to learn new things and become a better person. The fixed mindset, it turns out, is at the root of many of our most toxic cultural myths about “true love.” Dweck writes:

The growth mindset says all of these things can be developed. All — you, your partner, and the relationship — are capable of growth and change.

In the fixed mindset, the ideal is instant, perfect, and perpetual compatibility. Like it was meant to be. Like riding off into the sunset. Like “they lived happily ever after.”

[…]

One problem is that people with the fixed mindset expect everything good to happen automatically. It’s not that the partners will work to help each other solve their problems or gain skills. It’s that this will magically occur through their love, sort of the way it happened to Sleeping Beauty, whose coma was cured by her prince’s kiss, or to Cinderella, whose miserable life was suddenly transformed by her prince.

This also applies to the myth of mind-reading, where the fixed mindset believes that an ideal couple should be able to read each other’s minds and finish each other’s sentences. She cites a study that invited people to talk about their relationships:

Those with the fixed mindset felt threatened and hostile after talking about even minor discrepancies in how they and their partner saw their relationship. Even a minor discrepancy threatened their belief that they shared all of each other’s views.

But most destructive of all relationship myths is the belief that if it requires work, something is terribly wrong and that any discrepancy of opinions or preferences is indicative of character flaws on behalf of one’s partner. Dweck offers a reality check:

Just as there are no great achievements without setbacks, there are no great relationships without conflicts and problems along the way.

When people with a fixed mindset talk about their conflicts, they assign blame. Sometimes they blame themselves, but often they blame their partner. And they assign blame to a trait — a character flaw.

But it doesn’t end there. When people blame their partner’s personality for the problem, they feel anger and disgust toward them.

And it barrels on: Since the problem comes from fixed traits, it can’t be solved. So once people with the fixed mindset see flaws in their partners, they become contemptuous of them and dissatisfied with the whole relationship.

Those with the growth mindset, on the other hand, can acknowledge their partners’ imperfections, without assigning blame, and still feel that they have a fulfilling relationship. They see conflicts as problems of communication, not of personality or character. This dynamic holds true as much in romantic partnerships as in friendship and even in people’s relationships with their parents. Dweck summarizes her findings:

When people embark on a relationship, they encounter a partner who is different from them, and they haven’t learned how to deal with the differences. In a good relationship, people develop these skills and, as they do, both partners grow and the relationship deepens. But for this to happen, people need to feel they’re on the same side. . . . As an atmosphere of trust developed, they [become] vitally interested in each other’s development.

What it all comes down to is that a mindset is an interpretative process that tells us what is going on around us. In the fixed mindset, that process is scored by an internal monologue of constant judging and evaluation, using every piece of information as evidence either for or against such assessments as whether you’re a good person, whether your partner is selfish, or whether you are better than the person next to you. In a growth mindset, on the other hand, the internal monologue is not one of judgment but one of voracious appetite for learning, constantly seeking out the kind of input that you can metabolize into learning and constructive action.

In the rest of Mindset: The New Psychology of Success, Dweck goes on to explore how these fundamental mindsets form, what their defining characteristics are in different contexts of life, and how we can rewire our cognitive habits to adopt the much more fruitful and nourishing growth mindset.

https://bit.ly/35DyjGu

 

суббота, 14 ноября 2020 г.

The Feynman Technique: The Best Way to Learn Anything

 


If you’re after a way to supercharge your learning and become smarter, The Feynman Technique might just be the best way to learn absolutely anything.

Let’s explore the method Nobel prize-winning physicist Richard Feynman used to ensure he understood anything he studied better than anyone else.

There are four steps to the Feynman Learning Technique:

  1. Choose a concept you want to learn about
  2. Pretend you are teaching it to a student in grade 6
  3. Identify gaps in your explanation;  Go back to the source material, to better understand it.
  4. Review and simplify (optional)

***

If you’re not learning, you’re standing still. But how do we get feedback on what we’re learning? And how do we go about learning new subjects and identifying gaps in our existing knowledge?

Two Types of Knowledge

Feynman understood the difference between knowing something and knowing the name of something, and it’s one of the most important reasons for his success. Most of us focus on the wrong type of knowledge. The first type of knowledge focuses on knowing the name of something — what it’s called. The second focuses on actually knowing something — that is understanding something.

“The person who says he knows what he thinks but cannot express it usually does not know what he thinks.”

— Mortimer Adler

The Feynman Technique

Step 1: Teach it to a child

Take out a blank sheet of paper. At the top write the subject you want to learn. Now write out everything you know about the subject you want to understand as if you were teaching it to a child. Not your smart adult friend, but rather a 12-year-old who has just enough vocabulary and attention span to understand basic concepts and relationships.

It turns out that one of the ways we trick ourselves is that we use complicated vocabulary and jargon and it masks our lack of understanding.

When you write out an idea from start to finish in simple language that a child can understand, you force yourself to understand the concept at a deeper level and simplify relationships and connections between ideas.

Some of this will be easy. These are the places where you have a clear understanding of the subject. At other points, you will struggle. These are the points where you have some gaps in your understanding.

Step 2: Review

Only when you encounter gaps in your knowledge—where you forget something important, are not able to explain it, or simply have trouble thinking of how variables interact—can you really start learning.

Now that you know where you got stuck, go back to the source material and re-learn it until you can explain it in basic terms. Only when you can explain your understanding without jargon and in simple terms can you demonstrate your understanding. This is the work required to learn, and skipping it leads to the illusion of knowledge.

Identifying the boundaries of your understanding also limits the mistakes you’re liable to make and increases your chance of success when applying knowledge.

Step 3: Organize and Simplify

Now you have a set of hand-crafted notes. Review them to make sure you didn’t mistakenly borrow any of the jargon from the source material. Organize them into a simple narrative that you can tell. Read it out loud. If the explanation isn’t simple or sounds confusing, that’s a good indication that your understanding in that area still needs some work.

If you follow this approach over and over, you will end up with a binder full of pages on different subjects. If you take some time twice a year to go through this binder, you will find just how much you retain.

Step 4 (Optional): Transmit

If you really want to be sure of your understanding, run it past someone (ideally who knows little of the subject –or find that 12-year-old!). The ultimate test of your knowledge is your capacity to convey it to another.

***

Not only is the Feynman Technique a wonderful recipe for learning, but it’s also a window into a different way of thinking that allows you to tear ideas apart and reconstruct them from the ground up.

When you’re having a conversation with someone and they start using words or relationships that you don’t understand, ask them to explain it to you like you’re 12.

Not only will you supercharge your own learning, but you’ll also supercharge theirs. Importantly, approaching problems in this way allows you to understand when others don’t know what they are talking about. (See Batesian Mimicry)

Feynman’s approach intuitively believes that intelligence is a process of growth, which dovetails nicely with the work of Carol Dweck, who beautifully describes the difference between a fixed and growth mindset.


The Difference Between Knowing the Name of Something and Knowing Something

Richard Feynman (1918-1988) was no ordinary genius. He believed that “the world is much more interesting than any one discipline.”

His explanations — on why questionswhy trains stay on the tracks as they go around a curvehow we look for new laws of sciencehow rubber bands work, — are simple and powerful.

Even his love letters will move you. His love letter to his wife sixteen months after her death will stir any heart.

In this short clip (below), Feynman articulates the difference between knowing the name of something and understanding it.

See that bird? It’s a brown-throated thrush, but in Germany it’s called a halzenfugel, and in Chinese they call it a chung ling and even if you know all those names for it, you still know nothing about the bird. You only know something about people; what they call the bird. Now that thrush sings, and teaches its young to fly, and flies so many miles away during the summer across the country, and nobody knows how it finds its way.

Knowing the name of something doesn’t mean you understand it. We talk in fact-deficient, obfuscating generalities to cover up our lack of understanding.

How then should we go about learning? On this Feynman echoes Einstein, and proposes that we take things apart:

In order to talk to each other, we have to have words, and that’s all right. It’s a good idea to try to see the difference, and it’s a good idea to know when we are teaching the tools of science, such as words, and when we are teaching science itself.

[…]

There is a first grade science book which, in the first lesson of the first grade, begins in an unfortunate manner to teach science, because it starts off with the wrong idea of what science is. There is a picture of a dog–a windable toy dog–and a hand comes to the winder, and then the dog is able to move. Under the last picture, it says “What makes it move?” Later on, there is a picture of a real dog and the question, “What makes it move?” Then there is a picture of a motorbike and the question, “What makes it move?” and so on.

I thought at first they were getting ready to tell what science was going to be about–physics, biology, chemistry–but that wasn’t it. The answer was in the teacher’s edition of the book: the answer I was trying to learn is that “energy makes it move.”

Now, energy is a very subtle concept. It is very, very difficult to get right. What I mean is that it is not easy to understand energy well enough to use it right, so that you can deduce something correctly using the energy idea–it is beyond the first grade. It would be equally well to say that “God makes it move,” or “spirit makes it move,” or “movability makes it move.” (In fact, one could equally well say “energy makes it stop.”)

Look at it this way: that’s only the definition of energy; it should be reversed. We might say when something can move that it has energy in it, but not what makes it move is energy. This is a very subtle difference. It’s the same with this inertia proposition.

Perhaps I can make the difference a little clearer this way: If you ask a child what makes the toy dog move, you should think about what an ordinary human being would answer. The answer is that you wound up the spring; it tries to unwind and pushes the gear around.

What a good way to begin a science course! Take apart the toy; see how it works. See the cleverness of the gears; see the ratchets. Learn something about the toy, the way the toy is put together, the ingenuity of people devising the ratchets and other things. That’s good. The question is fine. The answer is a little unfortunate, because what they were trying to do is teach a definition of what is energy. But nothing whatever is learned.

[…]

I think for lesson number one, to learn a mystic formula for answering questions is very bad.

There is a way to test whether you understand the idea or only know the definition. It’s called the Feynman Technique, and it looks like this:

Test it this way: you say, “Without using the new word which you have just learned, try to rephrase what you have just learned in your own language.” Without using the word “energy,” tell me what you know now about the dog’s motion.” You cannot. So you learned nothing about science. That may be all right. You may not want to learn something about science right away. You have to learn definitions. But for the very first lesson, is that not possibly destructive?

I think this is what Montaigne was hinting at in his Essays when he wrote:

We take other men’s knowledge and opinions upon trust; which is an idle and superficial learning. We must make them our own. We are just like a man who, needing fire, went to a neighbor’s house to fetch it, and finding a very good one there, sat down to warm himself without remembering to carry any back home. What good does it do us to have our belly full of meat if it is not digested, if it is not transformed into us, if it does not nourish and support us?

 https://fs.blog/


Here his unique technique to learn new materials: Step 1. Choose a topic you want to understand and start studying it. Once you know what it is about, take a piece of paper and write the topic at the top of the page. Step 2. Pretend you’re teaching the idea to someone else. Write out an explanation on paper while you describe them out loud. Like this, you get an idea of what you understand and where you still have gaps. Whenever you get stuck, go back and study. Repeat that process until you can explain it. Step 3. Finally, do it again, but now simplify your language or use an analogy to make the point. If your explanation ends up wordy and confusing, that’s an indication that you do not understand the idea well enough. If that happens, go back until you have mastered it. It is the process of thinking about an idea while teaching it that makes the method so effective. Once you can explain an idea with simple language and create graphic analogies, you have deeply understood it and will remember it for a long time.