Talk:The Joke/@comment-38009555-20190101152805

The explanation is that when studying physics, you usually learn objects physics when they are spheres or squares and in a vacuum (no air resistance, etc), and then you should apply what you've learned to the real world when things are a lot more complicated. As it is a physicist that came to help, he says that his solution only works for "spherical chickens in a vacuum" (and thus not really helping). It is a well known joke about physics learning.