Killer whales migrate, study finds, but why?

Some killer whales, a study published Wednesday shows for the first time, wander nearly 10,000 kilometres (6,200 miles) from Antarctica's Southern Ocean into tropical waters -- but not to feed or breed.

Launch of EU's Galileo system set for Friday

The launch of the first two satellites for the European Union's Galileo navigation system was postponed until Friday - adding at least one more day to years of waiting for a program promoted as the main rival to GPS to get ...

Feeding the world while protecting the planet

The problem is stark: One billion people on earth don't have enough food right now. It's estimated that by 2050 there will be more than nine billion people living on the planet.

Google Maps taking armchair explorers to the Amazon

Two women washed clothes in the dark water of the Rio Negro as a boat glided past with a camera-laden Google tricycle strapped to the roof, destined to give the world a window into the Amazon rain forest.

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