On Fri, 06 Jul 2007 10:02:46 +0200 Andrew Kelly akelly@corisweb.org wrote:
learn to use an abacus.
Learn to use one anyway. I keep an abacus on a shelf beside my computer to do binary arithmetic with. It's great for binary stuff -- I can do that sort of calculation faster on my abacus than I can do them on paper or by trying to figure them out on the computer. Plus I can visualize the working of the operations and see if I'm going off of the rails.
I used to have a tiny little 10-wire abacus that came with a "how to use an abacus" book, but now I have a real nice 13-wire Chinese abacus and I wouldn't give it up.