Those weird quirks siblings have in common? Darwin had a theory kanw.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from kanw.com Daily Mail and Mail on Sunday newspapers.
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Siblings especially twins sometimes share the strangest traits, like throwing a ball with their head or picking up keys and crayons with their toes. Researchers want to know whqt's up with that.