Some customers want to find Viking ancestry, but almost every Briton has some, say researchers
Scientists have described some services provided by companies tracing ancestry using DNA as akin to astrology.
Some test findings tell people that they have links to groups such as Vikings, to particular migrations of people and sometimes to famous figures such as Napoleon or Cleopatra
But researchers working with a campaign group say DNA tests cannot provide accurate information about ancestry.
Ancestry companies insist they are able to provide a valuable service.
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