Seems like Obama has a lot more gray in his hair since his first inauguration. Is it from the stress of being President? What actually causes us to go gray? Laci Green explores the different factors.
After getting a look at President Barack Obama's graying head of hair, we got to thinking about why our hair turns gray. In particular, can stress cause your hair to go gray? Laci Green explains how stress can possibly lead to a silver head of hair.

DNews is a show about the science of everyday life. We post two new videos every day of the week.
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about 10 hours ago
NBD you guys, but we've been at @makerfaire getting shocked by a gazillion volts of electricity. http://t.co/GQK47vCqPe
about 16 hours ago
Passwords are practically useless! Learn about the new technologies so you won't have to remember all of... http://t.co/KkcPsGycQr
about 23 hours ago
If most of our DNA is useless, why not get rid of it? http://t.co/21zd5GePXP
yesterday
In the newest Reply All, we answer questions about topics ranging from gross bacteria helping people to... http://t.co/ni8SPd5cKo
yesterday
If alligators can regrow them, how come we can't regrow our teeth? http://t.co/bZ3eisR7KO
3 days ago
Have you ever wanted to know what a 3D scanned fetus looks like? We haven't really, either, but now you can! http://t.co/y7gJddg2KQ
