Is the sea getting saltier?

Why are humans so successful? Are new species still appearing? Is the sea getting saltier?
11 July 2014
Presented by Chris Smith, Redi Tlhabi

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How does a gastric bypass work? How do spaceships land safely back on earth? What makes humans so successful? Are new species still appearing? Is the sea getting saltier? Plus, news of biomarkers for Alzheimer's Disease...

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