I'm a late-20s American. I do have some basic understanding of metric units, although it is relative (a centimeter is about half an inch, a meter is a bit more

I'm a late-20s American. I do have some basic understanding of metric units, although it is relative (a centimeter is about half an inch, a meter is a bit more than a yard, a kilometer is slightly more than half a mile.). That all goes out the window when you add a second unit, though - kilometers _per second_ means absolutely nothing to me. Pardon me, the ignorant American... but this is who I am :D