The Neurosurgeon Who Advised Severance Breaks Down Its Science A neurosurgeon who has acted as a consultant for Severance explains the science behind the show’s brain-altering procedure—and whether it could ever become reality. By Rachel Feltman, Fonda Mwangi, Naeem Amarsy & Alex Sugiura Rachel Feltman: For Scientific American’s Science Quickly, I’m Rachel Feltman. Today we’re…