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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Thermoelectricity, electricity produced directly from heat. The production of electricity from heat is called the Seebeck effect, after the German physicist Thomas J.

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How Zero Works

You use the number zero all the time, but it may surprise you to learn that it sometimes isn't a number at all. It may surprise you even more to learn that it was all but invented. See what else surprises you about zero in this article.

What is number theory?

For many of us, a number is just a number, a bit of information that tells you, say, what time it is. But mathematicians look at that same number and divine relationships that underlie nature itself. Ready to enter the trippy world of number theory?

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