What does space smell like?

Astronauts may not expose their nostrils to the vacuum of space, but folks who come back from space walks report that they've brought a very distinctive odor back with them. And the space stations have their own special (and not necessarily pleasant) scents, including perfume of the Mir Space Station, which is… » 7/21/12 11:30am 7/21/12 11:30am

The truth about why things smell bad: Vibrating molecules

For over a century, our sense of smell has been explained with the "lock and key" hypothesis, which holds that each odor molecule has a particular shape that allows it to fit into particular smell receptors in the nose. But now a controversial study involving fruit flies suggests that hypothesis might miss the truth… » 2/15/11 5:00pm 2/15/11 5:00pm