FAQs
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Why does the sky change color before a tornado?
No one knows for sure. But there are a couple of theories that suggest what creates the strange greenish-yellow color that can precede a storm. »
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Jun 26, 2010
How often can you see sunrises and sunsets from the moon?
If you stood on the moon, you could see the sun rise and set. But you wouldn't see sunrise or sunset as often as we do on Earth. »
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Jun 25, 2010
Why isn’t there an eclipse every full moon?
There are more eclipses than you might think. There are from four to seven eclipses every year. Some are lunar, some are solar, some are total, and some are partial. »
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Jun 25, 2010
Are lunar eclipses more common than solar eclipses?
Depending on how you look at it, solar eclipses can be said to outnumber lunar eclipses...or the other way around. »
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Jun 24, 2010
What makes a rooster decide to crow?
A rooster crows because he has an internal clock that helps him anticipate sunrise. »
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Jun 21, 2010
Why isn’t the hottest weather on the year’s longest day?
In the northern hemisphere, the longest day is in June, but the hottest weather doesn't come until July and August. Why? »
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Jun 20, 2010
Is it true we use only 10 percent of our brains?
You don't use all your brain at once, but over the course of days your entire brain does get used. »
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Jun 15, 2010
How did plants come to have seeds?
Land plants evolved from ocean plants. That is, from algae. »
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Jun 15, 2010
What is the source of the heat in the Earth’s interior?
The heat inside Earth's contains enough energy to move continents, cause earthquakes and build mountains. Where does all this heat come from? »
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Jun 07, 2010
Can sandy deserts be made fertile?
Most desert soils are composed of sediments deposited during wetter periods of Earth's history. So they can, if irrigated, become quite fertile. »
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