Watch the pulse of New York City, measured in tweets

Scientists observe the daily heartbeat of different areas of New York City, through the lens of Twitter.

Collect call from E.T. Do you accept the charges?

Odds are there’s intelligent life out there somewhere among the stars. Why haven’t we heard from an alien civilization? One viewpoint, in this article. What do YOU think?

Cool facts about your biological clock

Feeling tired after turning the clock back? That's because the internal clock that controls your circadian rhythms needs time to adjust.

Remember to set your clocks back on November 2, 2014

Remember to fall back by setting your clocks back one hour, as Daylight Saving Time ends Sunday morning.

Why do we scream?

Despite our fascination with screams, science knows relatively little about them. The psychology of screams ...

Ebola is at least 16 million years old, says study

Ebola's first documented outbreak was in 1976. But the Ebola virus family has been around for 16 to 23 million years, says new research.

Spectacular explosion at launch for Antares rocket

Watch the NASATV live broadcast of the catastrophic launch failure. The rocket was bound for the International Space Station, loaded with supplies.

Exciting Rosetta space mission inspires a magical short film

A very good 7-minute film, called Ambition. It's not like any film about space exploration you've ever seen. The Rosetta comet mission lies at its heart.

Favorite scary weather scenes in horror movies

Are those loud rumbles of thunder - or pelts of hail hitting your roof and knocking on your windows - or a crazed psycho killer on the loose?

How often might Hawaii get a monster tsunami?

Scientists say that the tsunami that hit Japan in 2011 was a thousand-year event. A monster wave might strike Hawaii about as often.