Tweets say Hawaii is happiest state

Napa, California, is the US' happiest city, and Hawaii its happiest state. That's the conclusion of a research study from the University of Vermont, on the basis of the content of 10 million geotagged tweets.

Pulsar shows puzzling behavior

Astronomers are baffled by the discovery of a pulsar - a tiny spinning stars, heavier than the sun and smaller than a city - that emits different types of radiation at different times.

Twitter study shows we're getting more miserable

We may be richer, but we're more miserable, according to an analysis of tweets over the last three years.

Robots learn to walk the same way babies do

University of Vermont roboticist Josh Bongard has created robots that  change their body forms while learning how to walk - like tadpoles becoming frogs.