A planetary takeover by ocean algae 650 million years ago was the kick that transformed life on Earth.
Indian scientists say they can monitor the physiological health of elephants by analysing their dung.
UK shale deposits were formed 55 million years too late to trap large amounts of gas, a professor warns.
Galapagos photography competition 2017
Astronomy photo of the year shortlist
Field crickets return from brink of extinction
Supersonic car is set for low-speed runs
10 years of Galaxy Zoo, a citizen science phenomenon
Will nuclear fusion always be 30 years away?
Programmes, video and downloads: Solutions to air pollution from across the world