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After studying fossils in a region called Dragon Bone Hill in China, anthropologist Russell Ciochon of the University of Iowa concluded males of the species were clubbing one another over the head, probably to win females...
...For more than 100 years, researchers have pondered the odd shape of homo erectus' skull, which looks something like a bicycle helmet.
http://www.cnn.com/2004/TECH/science/02/12/coolsc.thickskulls/index.html