Paternal discrepancy

UK news:

LONDON (Reuters) - One in 25 fathers could unknowingly be raising another man's child, British scientists said on Thursday.

Researchers at Liverpool's John Moores University examined the findings of dozens of studies, published over the past 54 years, on cases of paternal discrepancy -- where a man is proved not to be the biological father of his child.

This is old news, of course. Many wives are unfaithful.