**Some other Posts **

The Unknown Thing – Why we use *x – A TED Talk*

Show Me the Math! Was math invented or discovered?

微积分 My calculus trip to China

No Foolin’ On truncated prime numbers

My Favorite Function Everybody should have one; this is mine.

My New Calculator The Curta – one of the first handheld calculators and it doesn’t need batteries.

What is a Solution? Thoughts on making up functions to solve an equation: We do it all the time!

What’s Your Favorite? What’s your favorite equation?

Difficult Problems and Why We Like Them

Calculators A short past and future history of graphing calculators

Lin McMullin’s Theorem

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