Blood tests are no fun. Luckily, a group of researchers at Harvard Medical School and Brigham and Women's Hospital, along with others, have come up with what could become the king of all blood tests—and it needs just one drop of blood to work. Even better, it tests for more than 1,000 virus strains to determine whether a person has had a virus in the past, even if they're feeling just fine today. Turns out, the human body never forgets a virus.
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Key Facts In This Video
The virus DNA in our genomes may have played an important role in the development of our complex brains. 00:24
Most of the time, the virus DNA in our genome doesn't do anything, and is considered "junk DNA." But in some cases, it can have harmful effects. 02:16
When viral genes are turned off in mice, embryos don't survive. 03:12