OT and apologies if this has already been posted, but science: New derivation of pi links quantum physics and pure math

Researchers stumbled upon a famous pre-Newtonian formula for pi while computing the energy levels of a hydrogen atom

In 1655 the English mathematician John Wallis published a book in which he derived a formula for pi as the product of an infinite series of ratios. Now researchers from the University of Rochester, in a surprise discovery, have found the same formula in quantum mechanical calculations of the energy levels of a hydrogen atom. […]

“It was a complete surprise — I jumped up and down when we got the Wallis formula out of equations for the hydrogen atom,” said [mathematician Tamar] Friedmann.