On Tuesday, NASA was going to drop a flying-saucer-shaped vehicle from a helium balloon high above Earth's surface, in preparation for future Mars missions. But the test has been delayed, due to weather.
Take a picture of a bird and identify it. This free new iPhone app is an electronic field guide featuring 500 of the most common North American bird species.
A new illustration of the seafloor, created by two of the world’s leading ocean floor mapping experts, details underwater terrain where the missing Malaysia Airlines flight might be located.
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