There are some great anti-flat earth examples in here - digging canals having to drop 8" per mile is obvious when you think about it. Objects being heavier at t

There are some great anti-flat earth examples in here - digging canals having to drop 8" per mile is obvious when you think about it. Objects being heavier at the poles and pendulums running faster because the earth is oblate, not a perfect sphere is also a clever illustration.