Research demonstrating quantum behavior for C60 buckminsterfullerenes, by sending them through a double-slit experiment. The only way to explain the resulting interference pattern in classical terms is to conclude that a single buckyball (or, more accurately, the entity that is later detected as a single buckyball) goes through two openings at once – two openings that are a hundred times farther apart than the diameter of one buckyball. (Nature 401, 1999)