We are taught that the electron is a fundamental particle. It has a specific charge (-e), and you cannot cut it in half. You cannot have 1/3 of an electron. But Horst Störmer and Daniel Tsui discovered a bizarre exception. They were experimenting with a "two-dimensional electron gas"—essentially trapping electrons in a super-thin interface between semiconductors. They cooled this system to near-absolute zero and applied a massive magnetic field (about a million times stronger than the Earth's).