It is with children that we have the best chance of studying the development of logical knowledge, mathematical knowledge, physical knowledge, and so forth. ↗
Don't get fancy. Have you cooked an apple pie? You don't know what you did wrong? Do this: Take two or three apples. Put them on a table. Study them. ↗
I was recently on a tour of Latin America, and the only regret I have was that I didn't study Latin harder in school so I could converse with those people. ↗