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toticdwldwkjdwccqeerqwedqwwNumbers as excessive as 30 p.c get thrown around when discussing that question. The reality could be rather less sleazy, but scientific knowledge is tough to return by on this case. Two studies, one by computational neuroscientists Ogas and Gaddam from Boston University and another joint one by Google and Columbia University, suggest that the share might be much lower.
