For most of us, checking the time is as simple as looking at a watch or a clock—but have you ever wondered how these devices keep time?

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I've heard a green laser beam is visible, but a red one is not. Why is this? 

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Thanks to a number of sensationalized movies and documentaries, you might be wondering whether there’s any truth to the claims that the world will come to an end on December 21, 2012. The reality is that all these stories are just plain wrong!

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You’ve probably heard the saying “leaves of three; let them be” – a warning to steer clear of the three-leafed plant poison ivy.

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Have you ever heard the saying: “You are what you eat”? This saying is especially true for Monarch butterflies.

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Our skin helps to keep countless bacteria, fungi and other foreign material from getting to our vital insides. So when we get wounded, it’s very important that our skin repairs itself. What happens when a wound heals?

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In the 1970s, the Earth’s ozone layer came under attack. More than 30 years later, the ozone layer's future is looking a lot brighter! 

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Christopher Nolan’s movie Inception, has raised many questions about how dreams work and what is possible while dreaming. While we can monitor the brain activity of dreamers, relatively little is known about the content or purpose of dreams.

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The feminization of fish is a problem that has been observed around the globe in freshwater and marine systems. What does this mean and why is it happening?

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In 1945, five Navy Avengers set out for a routine training session off the Florida coast and never returned. Since then, the public has been intrigued by the mysterious triangle-shaped area in the Atlantic Ocean capable of swallowing ships and planes.

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