http://www.ucsusa.org/arms/arms-home.html
http://www.fas.org/
Two science-based advocacy groups offer a wealth of on-line material about arms control. Founded at MIT in 1969, the Union of Concerned Scientists has, as one of its current focus areas, the so-called National Missile Defense project. The Federation of American Scientists began life in 1945 as the Federation of Atomic Scientists, which was founded by veterans of the Manhattan Project. Its frequently updated Web site recently featured satellite images of North Korea’s Nodong missile test facility.

http://www-spof.gsfc.nasa.gov/earthmag/demagint.htm
That Earth itself is a magnet was first realized 400 years ago by the English scientist Willliam Gilbert, who sought to explain why compass needles point north. To commemorate that coup de recherche, David Stern of NASA’s Goddard Space Flight Center has compiled The Great Magnet, The Earth, an extensive site about Gilbert’s life and work.

http://www.colorado.edu/physics/2000/cover.htm
The self-professed aim of Physics 2000, an educational Web site from the University of Colorado at Boulder, is “to make physics more accessible to students and people of all ages and to counter its current negative image.” The interactive site contains, among many other things, a series of animations that describe the principles and practice of Bose–Einstein condensation