[Hollylane]

Today is the birthday of Nobel Prize-winning Danish physicist Niels Bohr, born in Copenhagen (1885). Bohr theorized that atoms were composed of a small, dense nucleus that is orbited by electrons at a fixed distance from the nucleus. He also came up with the revolutionary principle of complementarity: that things like light or electrons can have a dual nature — as a particle and a wave, for example — but we can only experience one aspect of their nature at a time.