Ancestry.com, the genealogy site, is going to offer more advanced DNA testing for its members, helping people find ancestors all the way back to the 18th century. All you have to do is take a home DNA test. These days, home DNA tests are being used for far more than finding clues about Grandpa Joe or Great-Great Grandpa Isadore. There are groups that offer to find your perfect dating match based on DNA, and kits you can use to test for potential future health issues, like cancer, heart disease or obesity.