The US test-fires a weapon that can travel at five times the speed of sound, as part of plans to develop a new long-range rapid strike force.

A Brazilian indigenous leader is shot dead after taking his community back to ancestral lands that had been occupied by ranchers, activists say.

London's attempt to reduce pollution - with an adhesive spray

Four robots have set out from San Francisco on an epic 33,000 nautical mile journey across the Pacific Ocean.

Fishing nations agree to step up protection for bluefin tuna, sharks, swordfish and albatrosses, but conservationists say there are still holes in the net.