Tim Urban @waitbutwhy
It takes a googol years for a supermassive black hole to decay. How long is that? If you had an hourglass w/ a grain of sand for every particle in the universe, and 1 grain fell every 10 billion years, when it ran out you’d be < 1% thru the black hole’s life. h/t @Kurz_Gesagt — PolitiTweet.org
