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How do DNA tests tell if two people are related?

DNA tests can tell people where in the world their ancestors came from, and if they're at risk of developing different ...
Newsweek

Woman Pays $100 for DNA Test, Can’t Stop Laughing at the Results

A woman interested in learning more about her ancestry took a DNA test only to get an unexpected result. Shirley Huang, 25, lives in California but was born and raised in Hawaii, after her parents ...