Which jokes can only be understood by people with a certain amount of historical knowledge?

The son was lying on the sofa reading a pictorial. The mother walked into the house panting and said: "I bought a cart of coal. Now the coal cart is parked on the bridge and cannot be pulled up. Come and help mom push it." Give it a try!" "Hey, Mom, you don't understand science." The son lay still and tilted his head and said, "According to Newton's law of inertia, you only need to move the car back 20 meters and then rush forward. We can cross the bridge." Eddy Currents and Snails talks about it every time: When an alternating magnetic field passes through a metal section, eddy currents will be generated in the metal section. The students always laugh. You should be happy that they have such imagination. So imagine with them: when an alternating magnetic field passes through a metal section, there will be "countless snails crawling around concentric circles" in the metal section, but you must understand the reason for the "snail crawling": electromagnetic induction. Physicist Paradise Hide and Seek Once, all the scientists in Paradise played hide and seek together. Unfortunately, when it comes to Einstein, he's looking for someone. All the scientists went into hiding, except Newton. Newton just drew a square with a side length of 1 meter in front of Einstein, and then stood in front of him. After Einstein finished counting, he saw Newton and immediately shouted: Newton is out! Newton refused to admit it. As a result, other scientists came out and helped Newton prove that Newton was not out. What's going on? At this time, Newton confidently said: I am standing in the middle of a square of 1 square meter. In other words, I am Newton per square meter, so I am Pascal.