Free movement between the US and Mexico - the hottest of topics in the 2016 US presidential campaign - is not just a human issue.

A drug that destroys the characteristic protein plaques that build up in the brains of patients with Alzheimer's is showing "tantalising" promise, scientists say.

A rocket operated by the aerospace company SpaceX explodes on the launch pad at Cape Canaveral where it was being test-fired ahead of a launch.

An annular eclipse delivered a memorable spectacle across several African countries, as the moon's movement creates a "ring of fire" in the sky.

One of Australia's best-known landmarks, Uluru, has been filmed from a new perspective.

Scientists in China find that a dog vaccine can also protect large livestock against rabies infection.