Video: A "Turtle Positioning System" helps reptiles on their fantastic voyage.
Video: The worst drought to hit Venezuela in decades reveals an Andean town once submerged under water. Msnbc.com's Dara Brown reports.
Video: Get your green tips from Willie Garson and Angie Harmon.
Video: Rainn Wilson wants to give you his green tip of the day.
Video: A devastating spinal injury left 11-year-old Mackenzie Saunders paralyzed after a soccer match. NBC's chief medical editor Nancy Syderman discusses the girl's road to recovery with Mackenzie and her parents.
Video: A planned gold and copper mine could pose a serious threat to sockeye salmon population.
Video: A New York City chef whips up cheese using his wife's breast milk. WNBC's Ben Aaron tastes a sample.
Video: Uncovering the molecular secrets of what makes us tick.
Video: See never-before-seen footage of President Obama and his family's visit to Yellowstone National Park in the summer of 2009.
