Inventor James Dyson wants to use cyclone technology to rid the world's rivers and oceans of rubbish.
The finalists in the 11th annual Smithsonian Photo Contest have been announced, and you can help choose the winner.
Best photos of the day: 16 April 2014.
Best photos of the day: 15 April 2014.
Toxic cane toads have reached staggering numbers in Purnululu National Park, Western Australia.
Stanford University researchers construct geological history of Game of Thrones planet
Report finds natural-warming hypothesis can be ruled out with 99.9% confidence.
Firefighters battle deadly forest fires in Valparaiso, Chile for second night after coastal winds whipped up flames again.
7.5 magnitude earthquake beneath Indian Ocean triggers new warning.
Greenhouse gas emissions need to be slashed by up to 70% to avoid 4C-5C rise in temperatures, panel warns.
Our favourite news, sports and animal photos of the past seven days.
Artistic protest reflects dissatisfaction over air quality in China.
South Pacific nation struck by magnitude-7.3 earthquake off the island of Bougainville.
Best photos of the day: 11 April 2014.
ZSL's Edge birds danger list includes prehistoric-looking stork as tall as a human and an eagle