An image believed to be that of a hole-punch cloud. Scientists say airplanes create these patterns when they fly through certain types of clouds. The water in the clouds can turn to rain or snow and fall to the ground. H. Raab/Vesta/Wikimedia Commons hide caption

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H. Raab/Vesta/Wikimedia Commons

Snow Delay At The Airport? Blame Planes And Clouds

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Swaying Of Hammock Lulls Brain Into Deeper Sleep

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Student Inventors Dream Up A Better Wheelchair

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Mighty Mouse? Male Alston's mice use high-frequency songs to entice females. Bret Pasch/University of Florida hide caption

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Bret Pasch/University of Florida

Squeaking Up A Storm: Yes, That Mouse Is Singing

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This image from April 27 shows a series of tornadoes forming over Alabama and Mississippi. Captured from a satellite orbiting located at a fixed location above Earth, images like these help track trends in weather patterns. Another set of polar-orbiting satellites are useful for long-term forecast predictions. NASA Earth Observatory hide caption

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NASA Earth Observatory

Blind Eye In The Sky: Weather Satellites Lose Funding

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In A Flash Of Gamma-Rays A Star Is Gone

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By juicing up special cardiac stem cells, researchers hope to find a way for human hearts to heal when they're injured by a heart attack. PRNewsFoto/Zygote Media Group, Inc. via AP hide caption

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PRNewsFoto/Zygote Media Group, Inc. via AP

All Pumped Up: Can Stem Cells Fix Human Hearts?

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Growing Hearts and Bones

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Gene Mutations Offer Clues On The Autistic Brain

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Researchers Trap Antimatter For Record 16 Minutes

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iStockphoto.com

How To Put A New Element On The Periodic Table

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Scientists have known for a long time that nicotine decreases appetite among smokers, but they didn't know why. A new study finds that nicotine triggers a response in certain specific brain cells known to regulate appetite. iStockphoto.com hide caption

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iStockphoto.com

The Skinny On Smoking: Why Nicotine Curbs Appetite

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A female mosquito acquires a blood meal. This species, Aedes aegypti, carries and transmits the dengue fever virus. James Gathany/CDC hide caption

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James Gathany/CDC

In Heart Of Amazon, A Natural Lab To Study Diseases

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NASA engineer Ernie Wright looks on as the first six primary mirror segments for the James Webb Space Telescope are prepped to begin final cryogenic testing at NASA's Marshall Space Flight Center. The telescope will have 18 primary mirror segments. David Higginbotham/NASA hide caption

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David Higginbotham/NASA

Scientists Undeterred By Hubble Successor's Costs

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