Science & Environment
Also in the News
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.
Martian water streaks present exploration challenge
The immediate reaction of many to Monday's Mars announcement from Nasa on the existence of liquid water flows will be to want to go and investigate them. But that is easier said than done.