What are the Top Five Items Polluting the Ocean?
Millions of polluted items are recovered from the ocean but millions more remain.
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Researchers in South Africa have injected radioactive material into the horns of 20 rhinos.
This plant could help future human missions to explore and terraform the red planet.
The 13-year-old boy, Oran Knowlson, was sometimes having hundreds of seizures per day before the device was fitted.