I crossed the equator four times while in africa. Here is a picture of me standing on the equator, ready to test the coriolis force. I'd heard conflicting things about it - that it was too global of a phenomenon to see on a human scale, that it could be seen easily, or that it took special apparatus to see it. I now know that it can be seen easily with crude tools. All it takes is a bowl with a hole in it. Put some water and dead grass in, so you can clearly see the rotation. Stand on the lne - it goes straight down. Rotate it with your finger - it stops, goes straight down. Walk ten yards north - it slowly rotates counterclockwise. Force it in the other direction with your finger - it slows, stops, and returns back to it's own direction eventually. Walk ten yards south, see the same thing in reverse.
