Magnetism. The most familiar form of the physical phenomenon called magnetism is the ability of certain objects to attract iron. Such objects are called magnets. Magnetism is also associated with electric currents. Magnets are widely used. All electric motors (and the generators that provide power for the motors) contain magnets, as do telephones, tape recorders, and loudspeakers. The magnetic compass is a device used for finding direction. The earth itself is a huge magnet.
The female birth control pill has been around for decades, and many men would like to share the contraceptive responsibility. But despite the lingering promise of non-barrier, reversible male birth control options, the FDA has yet to approve any. As we wait for male birth control to become a reality, test your knowledge of its development so far.
Fusion reactors will use abundant sources of fuel, will not leak radiation above normal background levels, and will produce less radioactive waste than current fission reactors. Learn about this promising power source.