In a groundbreaking new study, NASA scientists found astronaut Scott Kelly didn’t come back the same when he returned from spending a year in space – his DNA is no longer the same as that of his identical twin brother.
Watch TV shows, movies and more on Yahoo View.
About NBC TODAY Show
NBC’s TODAY is the news program that informs, entertains, inspires and sets the agenda each morning for viewers across America. See More
Check out more stuff on Yahoo View
