Teachers love telling their classes that "there is no such thing as a stupid question," and students love proving them wrong.
A popular thread on Reddit had people sharing the stupidest things they ever heard from their classmates. The celebration of stupidity was inspired by a classmate who said that using solar energy "would shrink the sun and kill us all."
These students have a lot of learning to do.
A guy in one of my classes in high school didn't understand why a baby born in China then raised entirely in the US would be able to speak English instead of Chinese. He thought people were born automatically knowing a language.
10th grade Social Studies: When they launch rockets how do they get through the crust of the earth. Dude thought the atmosphere was the crust of the earth.