Plankton make up 98 percent of the biomass of ocean life and provide half of the oxygen on the planet. Scientists are working to figure out how climate change may be affecting these important microorganisms. M. Ormestad/Tara Oceans hide caption
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Polar bears in the Beaufort Sea in northern Alaska. Scientist Charles Monnett caused a stir with a 2006 report on polar bears that were drowning, apparently owing to a lack of ice. Steve Amstrup/Fish and Wildlife Service hide caption
Bats harbor many types of coronaviruses and were probably the original source of the new coronavirus that appeared in the Middle East. iStockphoto.com hide caption
Rita Desollar believes chicken jerky treats imported from China killed her German shepherd, Heidi. Rita Desollar hide caption
NASA says it has found proof that water shaped the rocks on the left, in a photograph taken by the Mars rover Curiosity (left). For comparison, the agency released an image of rocks from Earth (right). NASA hide caption
Thursday
The Emperor's Himalayan lavender tea is popular at Washington, D.C.'s Park Hyatt Tea Room, but please don't put milk in it. Courtesy of Park Hyatt hide caption
NASA says it has found proof that water shaped the rocks on the left, in a photograph taken by the Mars rover Curiosity (left). For comparison, the agency released an image of rocks from the Earth (right). NASA hide caption
Streams Of Water Once Flowed On Mars; NASA Says Photos Prove It
An electronic circuit in its first phases of dissolution. Fiorenzo Omenetto hide caption
A prison official examines the damage a day after a powerful earthquake hit the west coast of Indonesia in Banda Aceh on April 12. Adek Berry/AFP/Getty Images hide caption