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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Light, the form of radiant energy that makes vision possible. Since sight is the most important of the senses, light furnishes most of the information we have about our surroundings.

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How are voltage surges and spikes different?

What happens when there's too much voltage? Learn about the difference between voltage surges and spikes from this article.

How Gold Works

We love it. We wear it glittering around our necks and sparkling at our ears, wrists and feet. We pass it down to our children and hoard it in secret stashes. Why is this precious metal so prized?

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