Why Do You Know That?

We haven't done this one in a while, so today let's have a round of why do you know that?  It's the inverse of "Auto Mechanics to Quantum Mechanics" where instead of asking questions about anything from the mundane to arcane, in this case you provide answers.  Tell us anything interesting that you know.


West Side Story was the first Broadway production to have its Playbill sport the now ubiquitous yellow stripe at the top.

Duckpin bowling was invented by baseball hall of famers John McGraw and Wilbert Robinson when they were members of the championship Baltimore Orioles teams of the 1890s.  They owned a sports bar/pool hall/gymnasium called the Diamond and had ten pins shaved down for lanes in the bar area.  One of them -- no one remembers who -- told a local reporter that when you hit them, they fly like ducks and thus was born the name "duckpins."

So, what do you know and why do you know it?