Science & Environment
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Features & Analysis
Plastic oceans: What do we know?
As England prepares to introduce a charge for plastic bags - long after many other countries - David Shukman catches up on the latest research into plastic in the oceans.
Curiosity rover: The reward for 'whale watching' on Mars
When scientists first saw Whale Rock in images returned from Nasa's Curiosity rover on Mars, they really weren't sure what to make of it. Since then it's become the linchpin in a story about water on early Mars.