Nature is one of the top scientific journals out there -- awesome to see them covering barefoot. I've been wearing Vibram Five Fingers and running on the fore- and mid-foot for about two years. Running barefoot and landing on your heel jars your entire body (knees in particular) and isn't sustainable for long distances. Cavemen certainly didn't run this way, and we haven't evolved fast enough for our optimal mechanis…
For the mountain bikers out there - think of a full suspension bike versus a hardtail. The full suspension is undeniably a smoother ride, but it's universally agreed that a hardtail forces you improve your technical riding, since you don't have all that squish to eat up your mistakes.