Scientists have developed a way to carve shapes from DNA canvases, including all the letters of the Roman alphabet, emoticons and an eagle’s head. Bryan Wei, a postdoctoral scholar at Harvard ...

And they're clearly working. Clever marketing combined with holiday deals means parents are buying their kids DNA tests from companies 23andMe, AncestryDNA and MyHeritage.

In a holiday commercial, Dr. Seuss’s the Grinch receives a 23andMe DNA kit as a gift and logs on to the company’s website to check out his results.