Big Ideas: Birthplace of Humanity, Flying Taxis and New TB Vaccine

A controversial new study suggests that the evolutionary birthplace of modern humans was in northern Botswana. Plus, Nirmal Purja, a Nepali man, shatters speed record for scaling the world’s 14 highest peaks in only six months and six days. And measles wipes out the "memory" of the immune system, making the body "forget" how to fight infection.

    Big Ideas: Birthplace of Humanity, Flying Taxis and New TB Vaccine

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