Video: Some teens are biting each other, usually on the neck, as a way to declare love or friendship. |
Video: President Obama speaks to employees of Smith Electric, a company using a grant from the Recovery Act to build all-electric trucks and help create a 'Green Impact Zone' in a 150-block area of Kansas City. |
Video: 9 different invasive species of constrictors, with no natural enemies, run rampant in south Florida. |
Video: Residents of the Northeast are left searching for reprieve as a record heat wave scorches the Eastern seaboard. NBC's chief medical editor has tips on how to stay cool when the mercury rises. |
Video: Manny Howard, author of 'My Empire of Dirt: How One Man Turned His Big-City Backyard into a Farm' recalls funny stories on Comedy Central. |
Video: Former and current 'Dancing with the Stars' participants turn over some green tips. |
Video: The professional surfer and volleyball player assess the impact of the BP oil spill on the Louisiana coast. |
Video: Scientists study how to restore the flow of water that was interrupted years ago. |
Video: After decades of promise and curiosity, the flying car is closer to reality than ever. |
