These jokes all seem to rely on the same assumption: everyone thinks that knowledge, especially scientific knowledge, should be useful. So it’s funny to boast that one’s own brand of knowledge, whether experimental physics, mathematics, or cosmology, is useless.
这些玩笑似乎有赖于同样一种假设：所有人都认为知识，特别是科学知识，应该有某种用处。因此不管是实验物理学、数学或宇宙学，吹嘘自己的知识无用显得非常好笑。