It's OK to say, 'I don't know.'

Don't get frightened by not knowing things.

It is of great value to realize that we do not know answers!

Some of the Mental Models you will learn from this book:

- Leverage
- Reciprocity
- Compound interest
- The meaning of life
- The Golden Rule

And many more 📚

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There's a big difference between knowing the name of something and knowing something.

If you have a theory, you must try to explain what’s good and what’s bad about it equally.

In science, you learn a kind of standard integrity and honesty.

Physics is like sex: sure, it may give some practical results, but that's not why we do it.

Study hard what interests you the most.

'Compound interest appears when the interest generated is added to the initial capital, which causes the interest generated at first to generate new interest again.'

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The statements of science are not of what is true and what is not true, but statements of what is known with different degrees of certainty.

Fall in love with some activity, and do it!

Nobody ever figures out what life is all about, and it doesn't matter.

Not knowing is not failure.

It's the first step to understanding.

Have no respect whatsoever for authority; forget who said it and instead look what he starts with, where he ends up, and ask yourself:

'Is it reasonable?'

The trick to learning is enjoying.

Question authority.

No idea is true just because someone says so.

Test ideas by the evidence gained from observation and experiment!

If a favorite idea fails a well-designed test, it's wrong!

You have to learn all the big ideas in the key disciplines in a way that they’re in a mental latticework in your head and you automatically use them for the rest of your life.

Get the 100 Mental Models Program:

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Give me questions I can't answer not answers I can't question.

You're unlikely to discover something new without a lot of practice on old stuff.

It's okay to say 'I don't know' and 'I need help'.

Humility is necessary for growth.

'Teach your children early what you learned late.'

Get “Surely You're Joking, Mr. Feynman!” by Richard Feynman.

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Learn by understanding, not by memorizing.

It's OK to not know, the pleasure is in finding things out!