Ugh. I hate to say this, but the US is dumb enough to crash into the future hoping that other countries go renewable so oil is cheaper here. It's too late anyway.
Joke all you want, but I had a two year old in a high chair that ate my entire take out bowl of very hot penang thai curry. Diapers weren't fun for the next day, but he did it.
Depends so much on the kid. One learned about negative numbers when he was 6 and understood it immediately, including using them in sums, and absolute value. The other is this meme exactly in 3rd grade.
Don't do the Koo-Aiid man wrong!