How to multiply any two numbers in your head. Exponents and square roots too...

Quick: what's sqrt(1/e)? Within ten minutes, you'll be calculating this and a lot more…without a calculator.

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Grab your own version of the reminder file here: http://teslachronicles.com/think/SlideRule.pdf

What's the deal with the 'tau' business? https://tauday.com/

Practice this technique on some more problems. Put your answers in the comments. Show work for extra credit. :)

square root of 5 cube root of 5 πth root of 5 (hint, might take two passes) Find energy via E=mc^2 for a mass of 1 mg (hint: watch your units)

Teslanomicon book recommendation: http://www.geekthoughts.info/calculus-made-easy-being-a-very-simplest-introduction-to-those/

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You can send me snail mail: Think Like Tesla @ Geek Thoughts PO Box 63471 Sunnyvale CA 94089 ... https://www.youtube.com/watch?v=e9MwLzXdQ9E