If you can’t explain your thought to a five-year-old, you don’t understand it very well. by Albert Einstein)
2: This phrase, so loved by many, does not say a word about the time that needs to be spent on it. And a five-year-old child can explain the quantum in terms of stones and glasses, only time for the preparation of such sentences will have to spend so much that the child will quickly finish the profile university and learn the appropriate formal language. Mathematics, therefore, creates its analytical apparatus to put a whole series of (inserted) considerations literally in one line of symbols.

“If you can’t explain your thoughts to a five-year-old, if you can’t explain your thoughts to a five-year-old, then you don’t understand it very well. Explanation is limited to 1 year.
2: Interesting observation, but Einstein still left traps: you can always, for example, start moving a child at around-the-light speed, thus winning time :)