sciencehabit writes "Archaeologists have long debated when early
humans began hurling stone-tipped spears and darts at large
prey. By throwing a spear, instead of thrusting it, humans could
hunt buffalo and other dangerous game from a safe distance, with
less risk of a goring or mauling. But direct evidence of this
hunting technique in early sites has been lacking. A new study
of impact marks on the bones of ancient prey shows that such
sophisticated killing techniques go back at least 90,000 years
ago in Africa and offers a new method of determining how
prehistoric hunters made their kills." Navigate with confidence
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now. sciencehabit writes "Whooping cough, or pertussis, has
exploded in the United States in recent years. A new study
(abstract) confirms what scientists have suspected for some
time: The return of the disease is caused by the introduction of
new, safer vaccines 2 decades ago. Although they have far fewer
side effects, the new shots