UTILIS
Get flash to fully experience Pearltrees
If Satan plays miniature golf, this is his favorite hole. A ball struck at A, in any direction, will never find the hole at B — even if it bounces forever. The idea arose in the 1950s, when Ernst Straus wondered whether a room lined with mirrors would always be illuminated completely by a single match.
The Black Hole
How to Unlock a Computer Without a Password If you have found yourself locked out of your computer for any reason, the following simple steps will allow you to gain...