In Depth
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What actually killed the dinosaurs? New clues heat up the debate
- How one man's autograph collection is 'reflection of a changing world'
- Venezuela crisis 'threatens disease epidemic' across continent
- Captive IS women begs for food and medicine in Syria camp
- Astronomers ask children to help them contact aliens
Photos
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The art of the brick: Incredible Lego sculptures
- Nasa discovers 'holy grail' solar system: Distant planets beyond our galaxy
- Nasa's 'holy grail' solar system: The biggest space discoveries
- I can guess what coin you're holding! Trump's odd handshakes
- Underwater Photographer of the Year: Shipwrecks, whales and a giant octopus