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Noctilucent clouds, high-altitude clouds that appear to glow in the sky at night, usually show up in the Southern Hemisphere summer. Satellite images showed them covering Antarctica in early November.

Experts warn the multiple military probes into abuses at Abu Ghraib prison will produce much information but few answers about who is ultimately responsible. Critics worry the Bush administration hopes to bury responsibility in mountains of data. Others say documents already leaked point the finger of blame at Secretary of Defense Donald Rumsfeld. Hear NPR's Jackie Northam.

This past week, the Justice Department asked the Internet company Google to turn over its search records, which prosecutors say would help them defend a controversial child pornography law. Google refused.

Cloud seeding is a safe and proven technology widely employed by desert states in the U.S. to increase precipitation.

Virtually all major car and tech companies are pursuing self-driving technology as the future of transportation. But Tesla and Google are the earliest innovators, taking very different approaches.

Microbes can thrive in extreme environments, from inside fiery volcanoes to down on the bottom of the ocean. Now scientists have found a surprising number of them living in storm clouds tens of thousands of feet above the Earth. And those airborne microbes could play a role in global climate.

David Greene reports on a recent settlement between Google and French publishers and authors.

Google opened its developers conference Wednesday with a few announcements. The big news was that it will sell its own tablet computer to compete with Amazon's Kindle Fire and Apple's iPad. Google also announced more content for its online store.

NPR's Scott Simon asks former Google engineer Kathryn Spiers about her firing after she posted an internal message about employee rights in the workplace.

Pianist Yael Weiss talks about her latest project, 32 Bright Clouds: Beethoven Conversations Around the World.