Dollars

Got some yesterday so I've got some cash and it raises a question:
How do the Yanks tell their money apart? All the notes are the same size and colour, just the number is different. Not very friendly for the hard of seeing/blind. Or just inconvenient. When I open my wallet, I know the little green one is a fiver, the orange one is a tenner and the large purple one is a twenty, all other countries I've been to have similar differences.
Oh, and they really look like Monopoly money... ;o)

Enrolling at Hogwarts

go to The Harry Potter page

As I feared, I'm in Hufflepuff
And my wand is Mahogany, with a Unicorn hair, 8 inches long

At least the wand has style... ;o)