Optimists less likely to develop heart disease, at lower risk of death than pessimists.img src="http://feeds.feedburner.com/~r/Livesciencecom/~4/nYESwWMwHMI" height="1" width="1"/

Organic molecules in Mars meteorites did not originate in alien microbes.

Also in the works: A computer than can tell when you are pissed at it.

The strange Medusae Fossae Formation may be 2 billion years older than previously thought.

Dramatic changes in pressure did not appear to harm hitchhiking mollusks.

A new petition asks to make taxpayer-funded research free to everyone to read. Startups and small businesses would benefit, they say.

NASA's Cassini probe is preparing to tilt its orbit around Saturn dramatically.

According to a study done by MIT, most people smile when frustrated. They have gone on to create a computer program to differentiate between happy smiles and frustrated smiles. This research is done in part to better understand autistic behavior.