In this image made available from Oriental Institute of the University of Chicago, on Thursday June 19, 2014 shows scientists work on a skeleton in a grave in northern Syria in 2010. In a skeleton more than 6,200 years old, scientists have found the earliest known evidence of infection with a parasitic worm that now afflicts more than 200 million people worldwide. Archaeologists discovered a parasite egg near the pelvis of a child skeleton in northern Syria and say it dates back to a time when ancient societies first used irrigation systems to grow crops. (AP Photo/Gil Stein, Oriental Institute of the University of Chicago)
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