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