Scientists create test-tube burger with lab-grown beef
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.
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'A bumpy ride ahead': Astronomer Martin Rees on humanity's chance of surviving the 21st century03:48
The search for alien life in Nevada05:09
Behind the accidental discovery helping coral grow in record time02:10
In a real-life Star Trek discovery astronomers think they might have found Vulcan01:58
Inside the heated battle over Juul: Creating teen addicts or saving lives?10:02