10-easy-arithmetic-tricks

http://listverse.com/science/10-easy-arithmetic-tricks/

Salubrion Enso Clock

http://feeds.feedburner.com/~r/CoolTools/~3/237728665/002645.php

http://www.eyeclops.com/

http://gizmodo.com/assets/resources/2008/02/nightvision.jpg

http://www.olympics.org.uk/gallerysimple.aspx?PH=47&type=&Page=4&game=&AT=&sport=0

Sprinter E MacDonald Bailey trains at Lilleshall for the 1952 Helsinki Olympics. In a terrific finish, Bailey gained bronze in the 100 Metres, his time equaling that of the winner Lindy Remigino of the United States.

Rules of Thumb

http://feeds.feedburner.com/~r/CoolTools/~3/229581871/002615.php