Laser, a device that generates or amplifies waves of visible light or of such other forms of electromagnetic energy as ultraviolet and infrared radiation.
WHAT'S INSIDE: PHYSICAL SCIENCE
Physical science is the study of the physical world around you. Learn about everything from electricity to magnetism in this section.
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Chemistry
Chemistry is the science of matter and the changes it undergoes during chemical reactions. In this section, learn about everyday chemistry, from chlorine beach to helium, and even why chocolate turns gray.
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Alpha, Beta or Gamma? It's the Nuclear Radiation Quiz
We live in a radioactive world, and we're not just talking about the times when a nuclear plant is melting down and scaring the heck out of us. How much do you know about the ABGs (or alphas, betas and gammas) of nuclear radiation?
How Telescopes Work
For centuries, curious observers have probed the heavens with the aid of telescopes. Today, both amateur and professional scopes magnify images in a variety of ways.
