WASHINGTON (Reuters) - Researchers using closed-circuit televisions to create an illusion have made volunteers virtually swap bodies, even making women believe they were in a man's body and vice-versa.

The planet's magnetic poles are being displaced. Scientists say that mankind may eventually find itself defenseless against the cosmic radiation, and the Earth will turn into the giant Hiroshima.

These population expansions had nothing to do with agriculture, but were most likely to have been driven by climate change - in particular, global warming and the resulting sea-level rises at the end of the Ice Age between 15,000-7,000 years ago."

A huge set of new Hubble Space Images show galactic collisions in action and the variety of peculiar forms that merging galaxies can take.

Holograms are normally produced with the aid of laser beams, starting by creating a prototype from photosensitive material such as Fotoresist.

The Amazon was the chic eco-cause of the 1990s, revered as an incomparable storehouse of biodiversity. It's been overshadowed by global warming. Brazil now ranks fourth in the world in carbon emissions, and most of its emissions come from deforestation.

The origin of life remains the deepest of enigmas: How did this supremely complex phenomenon get started? The explanation historically has revolved around DNA, the genetic molecule that serves as a pattern for building proteins.

BUDAPEST (Reuters) - Hungarian scientists are working on computer software analyzing dog barks that could allow people to better recognize dogs' basic emotions, Hungarian ethologist Csaba Molnar said.

CHICAGO (Reuters) - U.S. researchers say they have coaxed hearts from dead rats to beat again in the laboratory and said the discovery may one day lead to customized organ transplants for people.

LONDON (Reuters) - South African double amputee Oscar Pistorius, who runs with carbon fiber blades attached to his legs, will not be allowed to compete at this year's Beijing Olympics.