Raspunsul aici:
http://www.msnbc.msn.com/id/6750793/
Pt cine are curiozitatea sa citeasca articolul:
http://www.sciencemag.org/cgi/content/full/307/5710/720?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&titleabstract=hai+gray&searchid=1116025749574_10738&stored_search=&FIRSTINDEX=0&fdate=10/1/1995&tdate=5/31/2005