Scientists at the University of Life Sciences in Prague have found that dogs are sensitive to Earth's magnetism. In fact, they're so sensitive that they poop aligned to the planet's magnetic field. I don't know what that means or why is it useful, but I find it fascinating.
In the 1920s, John Watson, the founder of behaviorism, conditioned an 11-month-old baby known as "Little Albert" to be scared of a rabbit and a rat. He did this by making disturbing noises when the baby was shown either of these animals.