DNA testing is increasingly being used by some as a tool for genealogy research. Chris Pomery discusses how tracing DNA can help expand a family tree. The various organisations and schemes promoting this methodology are discussed along with web addresses of DNA testing companies. Information on how to set up a DNA testing project among family members and possible pitfalls is examined. The author also describes the Genographic Project sponsored by National Geographic which since 2005 is investigating migration paths of people throughout the world from Africa.