Archaeologists unearth thousands of stone tools in North America they say predate the technology widely assumed to have been carried by the first settlers.

Curcumin, a molecule already known for its powerful medicinal properties, could also work as a detector for common explosives, research indicates.

Conservationists ask the public to take part in the first survey of the UK's threatened oil beetles.

Evidence suggests that botanic gardens play a part in the spread of invasive alien species, which have escaped from collections, a study concludes.

Rhino populations in Africa are facing the "worst poaching crisis for decades" as more than 800 are killed in the past three years, say conservationists.