Physicists Try to Revive a Super-Safe, Decades-Old Cancer Treatment
In a room at Northwestern Medicine Chicago Proton Center, Robert Johnson keeps a small collection of plastic heads. At first glance, they look like they\u2019ve been lopped off the top of department store mannequins. But they\u2019re more lifelike than that\u2014made of materials that mimic bone, flesh, and brain. \u201cOne of them even has a gold filling,\u201d he says.