Philip Ball looks at how a little-known paper by Niels Bohr demonstrates the turmoil in physics on the brink of quantum ...

But there was good evidence he was right: the electrons in his model lined up with the regular patterns (spectral series) of light emitted by real hydrogen atoms. Bohr's theory that electrons ...

Niels Bohr was born and educated in Copenhagen ... His model was a huge leap forward in making theory fit the experimental evidence that other physicists had found over the years.