"These places may hold small asteroids, which could be leftovers from a Mars-sized planet that formed billions of years ago"


So... Mars?

Obviously your UID will go for cheap since it hasn't gotten much use (as evident by your double post)

I've used cash for all of the above except buying a bus ticket b/c I don't ride buses. Even fast food places have credit card swipers. Hell, Sonic has a credit card reader at the drive up menu. And yes at bars, you start up a tab on your card and it only gets swiped once, not for each drink. Not a big deal. I hardly ever use cash; I don't think there are many places at all were credit cards aren't an option anymore except maybe a vending machine. I even use a credit card to buy things at Goodwill! Us young'uns don't use cash for much anymore. I typically don't even carry more than 20 dollars. However, I am not disputing the point that the US should differentiate the bills to be discernible for the blind. That's fine. Just disputing your argument's basis.