Calculate the surface area of your body or the position of the sun in the sky. This is simply an encyclopedia of a web site. Topics of almost any subject you can think of. This site is for absolutely everyone. You'll visit this site for hours and hours.
Kids also learn about secret messages and how secret codes are used in real life.
Mensa provides a forum for intellectual exchange among members. This is an excellent site offering free downloadable games, programmes and utilities. Newsgroups and Email facilities are offered and weekly magazines can be requested. This is an American site. Great fun and loads of tricks to buy.