This Week

Microbial bliss

You need bugs in your gut!

Scientists are proving that intestinal bacteria can help health -- but for what conditions? Should you take probiotic supplements or eat foods with beneficial bugs? What does the science say -- and not say? ...more

Last Week

Brain battle

Early bird vs. night owl!

As the day wears on, both sleep pressure and the brain's alerting signal rise, until sleep pressure triumphs. [Nod]. New brain study explains why night owls don't get as sleepy during the day. ...more

In The News

Earthquake shakes Mexico City.

Buildings sway, but no damage or death reports are available. ...more

Flu outbreak in Mexico kills 16

Schools, universities closed. Parallelling 19189 flu, the virus is worst among young adults. This swine flu reminds us of "bird flu." ...more


The Why Files Blog

Archives

New Why Files Book!


Now on Sale

Cool Science Images

A flat-tailed house gecko skydiving

Gecko!

Virtual Science!

©2009 University of Wisconsin
Board of Regents

About Us

THE WHY FILES

is an online science magazine. Since 1996, our award-winning coverage of the science behind the news has helped make science accessible and understandable in the context of current events.

Talk to us

About this site

About the team