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How Much Do You Know About These Precious Gems and Metals?

play.howstuffworks.com/quiz/how-much-do-you-know-these-precious-gems-metals

There are roughly 4,000 distinct types of minerals on Earth. But just a few -- thanks to happenstance and human longing -- are considered precious. How much do you know about our planet's precious gems and metals?

How a Nuclear Reactor Works

science.howstuffworks.com/nuclear-reactor.htm

Over the years, nuclear reactors have been viewed as both a miracle and a menace. How does a nuclear reactor do its job? And what happens when something goes wrong?

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