# Cool Facts

## The Church of Ultrafinitism

“God created the natural numbers, all else is the work of man.”(Kronecker) This is rather neat: an ultrafinitist is one who denies the existence of infinite sets, in particular, the set N of natural numbers. The reason being that N can never be completed. A lot of serious work on ultrafinitism was accomplished by Esenin-Volpin …

## 10/10/10 Day

10/10/10 Day according to google: And: Spiked Math’s take on 10/10/10 Day.

## SOH CAH TOA

(via Notes from the nucleus) Another version: Sex On Hard Concrete Always Hurts The Orgasmic Areas.

## Multiple choice question

Multiple Choice:If you choose an answer to this question at random what is the chance you will be correct? A) 25% B) 50% C) 60% D) 25% (discussion at the Math Subreddit)

## The Bailey-Borwein-Plouffe formula

This is an excellent story about the so-called Bailey-Borwein-Plouffe algorithm and formula. The BBP formula is an expression for calculating pi discovered by Simon Plouffe in 1995: This is a remarkable formula because it is a digit-extraction algorithm for pi in base 16. Simon Plouffe describes his discovery of the formula and the consequences he …

## Sine Graph

See if the above makes sense. It illustrates that cos(x) is indeed the derivative of sin(x).

## Four time lottery winner

This is interesting… Joan Ginther from Texas, has won multi-million dollar lottery jackpots four times so far! In 1993 she split \$11 million. In 2006 she won \$2 million. In 2008 she won \$3 million. Last month, she won \$10 million. That’s close to \$21 million in winnings for Joan! …

## Using twitter to predict movie box office revenue

This is neat. Asur and Huberman (HP Labs California) have analyzed the rate of tweeting versus opening weekend box office revenue. As expected, they found a strong correlation between the amount of tweets concerning a forthcoming film, and its opening weekend box office return (lots of people talking about it, means lots of people want …

## Hidden Matlab Fun (Easter Eggs)

Have some fun with Matlab today. Here are some easter eggs for the program (it may depend on your version, but all of these worked on mine). Open the Matlab command window and type one of the following to get a nice surprise: >> imageThis one gives an image of a boy. >> spyThis one …