One hundred thirty-seven is the inverse of something called the fine-structure constant. ...The most remarkable thing about this remarkable number is that it is dimension-free. ...Werner Heisenberg once proclaimed that all the quandaries of quantum mechanics would shrivel up when 137 was finally explained.
Leon M. Lederman, The God Particle: If the Universe Is the Answer, What Is the Question?
fine-structure-constant, physics, quantum-mechanics, werner-heisenberg