Towards the beginning of the article:
No other fundamental particles do this. “Only the neutrinos can change from one type to another,” says André de Gouvêa of Northwestern University in Evanston, Illinois. More than a quirk of nature, this ability to mutate on the fly points to some deep questions in physics, and potentially, some important answers.Not so much "shape shifting" as "transmogrifying," but it still works. No mention of Changelings either.
