National DNA day on April 25 celebrates the day that Crick, Watson, et al published their papers on the structure of DNA. There is an article in Wikipedia about it at https://en.wikipedia.org/wiki/DNA_Day

Both Ancestry.com and Family Tree DNA have been celebrating this date with sales of autosomal DNA test kits that end today. So buy a few!

23andme did not have a sale, but has sent a $50 off coupon out to people who have already tested there as a mother’s day sale or gift and that is good through next Sunday.

See my DNA testing page for a comparison of the sites. Remember that if you test at ancestry you can transfer those results to Family Tree DNA (click here for my post on that with the details)