this is possible thanks to the information in DNA(or deoxyribonucleic acid). your hair and every cell in your body contains your own unique DNA. it can tell you a lot about your family, health, and personality.DNA was discovered by a german scientist, friedrich miescher, in 1869, but nobody realized its importance then. other scientists thought that it was too simple to contain the map of how we are made! in 1953, a group of british scientists at cambridge university finally discovered the structure of DNA and how it worked. they were given the nobel prize for medicine in 1962
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