IUPAC
Nomenclature of Organic Chemistry
Jmol
Usenet
Physics FAQ - a very interesting collection of puzzles in
different subjects of physics
How Everything
Works - by Lois Bloomfield
The Flying Circus
of Physics
Mensa - Are you mensa-worthy, i.e. among the top 2% IQ people? Only one way to find out --try.
Online
integrator- from Wolfram Mathematica
Wolframtones - instantly
create unique music