On Nature's website:
“Descartes said that if there's something you can be certain of in this world, it's that your hand is your hand,” says Ehrsson.Um, whoops! Descartes said that what he couldn't doubt was his own thinking. It was G.E. Moore who famously said it would be absurd to suggest that he didn't know that "here is a hand".
Descartes, G.E. Moore, whatever! It's only philosophy, after all -- not something worth bothering to get right in the the flagship journal of the natural sciences.
(If I sound prickly, maybe it's because I'm currently on hold with AT&T, about to talk to my eleventh representative in two months about being double billed for internet service.)
Update, Dec. 15: The author of the piece has now corrected the error. It turns out that philosophy is worth getting right after all!