Thunderstorms with lightning do happen more often when air temps are warm, but it's possible to see lightning in cold weather, too - even during a snowstorm.
The U.S. has the resources to meet an increasing global need for rare earth elements - elements used in high-tech products and technologies for alternative energy - according to Keith Long.
The Shark Conservation Act - passed by U.S. lawmakers this week and now headed for President Obama's desk - would tighten the ban on capturing sharks for their fins.
Thousands of new flowering plants - unknown to the world - might sit in storage for 50 years before it earns the title of "new species," according to a new study.
Finally the weather lifted, and Operation IceBridge made a series of flights over the Antarctic Peninsula and a crucially important flight over the South Pole.
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