Statistics are easy :
http://www.businessweek.com/magazine/correlation-or-causation-12012011-gfx.html
Statistics are easy :
http://www.businessweek.com/magazine/correlation-or-causation-12012011-gfx.html
Here are some photos from the Yorkshire Sculpture Park :

Check out the example in the 3rd comment :
http://code.activestate.com/recipes/413137-call-a-functionmethod-x-times-per-second/
That is cool.