Video: NBC space expert James Oberg discusses the next phase in U.S. space exploration after NASA retires the shuttle program in June. |
Video: Check out Cookie the Little Penguin from Cincinnati. |
Video: A sideways funnel cloud was captured on video as it split off from a massive tornado near Tuscaloosa, Ala., ourAmazingplanet explain how these unusual twisters form. |
Video: At least 173 people were killed in five states after tornadoes tore across the South. The Weather Channel’s Jim Cantore and Jeff Morrow report from Alabama, where a state of emergency has been declared. |
Video: Tree rings are nature's historians. |
Video: St. Louis residents are picking up the pieces after a tornado tore through a densely populated suburban area over the weekend. |
Video: Nancy Sutley, chair of the Council on Environmental Quality, and Heather Zichal, deputy assistant to the president for Energy and Climate Change, take your questions from the South Lawn of the White House in honor of Earth Day. |
Video: Under relaxed federal rules, bison are now allowed more room to roam outside Yellowstone National Park. |
Video: Find out more about the life of beluga and narwhal whales. |