Prime Day deal: Take $100 off a 23andMe Health and Ancestry Kit

SAVE $100: 23andMe's Health and Ancestry Kit — one of Mashable's favorite DNA tests — is on sale for 50% off for Prime Day as of Oct. 13. DNA test kits have been popular holiday gifts for a few years running — and this year, with Prime Day effectively kicking off holiday shopping season, they're particularly attractive options.  23andMe's Health and Ancestry Kit, which includes autosomal testing (also known as the "family finder") as well as mtDNA, Y-DNA, and health and trait analysis, is...