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Simple can be harder than complex; you have to work hard to get your thinking clean to make it simple.

- Steve Jobs

If you thought that science was certain - well, that is just an error on your part.

- Richard Feynman

If you can't explain it simply, you don't understand it well enough.

- Albert Einstein

Intelligence is the ability to adapt to change.

- Stephen Hawking

Truth is ever to be found in simplicity, and not in the multiplicity and confusion of things.

- Sir Isaac Newton

To know that we know what we know, and to know that we do not know what we do not know, that is true knowledge.

- Nicolaus Copernicus

A man's friendships are one of the best measures of his worth.

- Charles Darwin

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