We went and visited the equator today, which was pretty fantastic. The classic monument wasn't so exciting, but there was another museum a few hundred metres down the road that was located on the real equator. They proved it by pouring water down a drain and demonstrating the Coriolis effect in both hemispheres and on the equator (on the equator, it just goes straight down!). Here, an egg is balanced on a nail, something pretty easy to do while standing with each hemisphere exerting the exact same force on you. Neat stuff.