Two things I learned recently from listening to 99% Invisible:
1) we are living in "The Post-Billiards Age," which makes me very sad, because I love billiards . . . but more significantly, back in the age of billiards-- before the invention of plastic-- the only viable material for high quality billiard balls was ivory, and you could only get three balls per elephant tusk . . . so a hell of a lot of elephants had to die in the name of billiards;
2) because highways are "Built for Speed," most people estimate that the white dashed lane-divider lines are approximately two feet long, but they are actually ten to fifteen feet . . . and I confirmed this by slowing down on Route 1 and looking out my window-- the lines are approximately the same length as my van.