Scientists create test-tube burger with lab-grown beef05:13
Using cattle stem cells and other ingredients, a group of scientists is working to convince the world that a more environmentally friendly meat is needed and can be made in the lab. NBC’s Keir Simmons reports and Dr. Mark Post, one of the scientists working on the project, discusses its importance.
What happens in your brain when you’re falling in love01:54
2004: Mars rover discovers evidence of water on Red Planet01:37
This powerful laser beam is helping track the moon02:56
China's experiment proves life is possible on the Moon01:21
Watch this huge floating ice disk found rotating in Maine river01:08
This is how solar panels work01:15