In 2018, fifty-one countries voted on the value of a constant of nature In November 2018, delegates from 51 countries gathered at Versailles and voted on the value of Planck’s constant. Since May 20, 2019, h = 6.62607015×10⁻³⁴ J·s. Exact. By definition. Not approximate. Not “the best available value to date.” Exact and permanent. This deserves a moment’s pause. The…