The human race must move to a planet beyond our Solar System to protect the future of the species, physicist Professor Stephen Hawking has warned. He told the BBC that life could be wiped out by a nuclear disaster or an asteroid hitting the planet.
The first humans who left Africa to populate the world headed south along the coast of the Indian Ocean, Science magazine reports. Scientists had always thought the exodus from Africa around 70,000 years ago took place along a northern route into Europe and Asia.
Scientists have used DNA to re-trace the migrations of a sea-faring civilisation which dominated the Mediterranean thousands of years ago. The Phoenicians were an enterprising maritime people from the territory of modern-day Lebanon.
Prehistoric humans roamed the world's largest desert for some 5,000 years, archaeologists have revealed. The Eastern Sahara of Egypt, Sudan, Libya and Chad was home to nomadic people who followed rains that turned the desert into grassland.
Argentine ants living in vast numbers across Europe, the US and Japan belong to the same inter-related colony, and will refuse to fight one another. The colony may be the largest of its type ever known for any insect species, and could rival humans in the scale of its world domination.