In this issue:
"First of Our Kind": Recently discovered fossils from South Africa could revise long-held ideas about how we came to be human.
"This is Your Brain in Meltdown": Neuroscientists explain why stress can make the mind turn to mush.
"Bound for the Moon": The next rover to roam the moon’s surface may come from college students and private companies working on a shoestring budget.
"Polio’s Last Act": A component of the most widely used polio vaccine now causes more disease than the virus it is supposed to fight.
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