We Are Running Out of Sand

Yes. SAND.

One of my favorite TV series of all time is the original Cosmos, hosted by Carl Sagan. In it, Sagan says, “The total number of stars in the Universe is larger than all the grains of sand on all the beaches of the planet Earth.” In fact, there are probably ten times as many stars as grains of sand on Earth. And that’s a low estimate. It really drives home how vast our universe is because there are…