“It involves growing hair from stem cells—not fetal, but stem cells derived from a person’s own skin or blood—and implanting hair follicles rich with dermal papillae into the space around a person’s old, shrunken, dormant follicles.” (It’s incredible how determined scientists are to fill in my bald spot.) James Hamblin in The Atlantic: Thanks to stem cells and 3-D printing, Soon There Will Be Unlimited Hair. (That makes me feel even more guilty for harvesting from my kids all these years.)