The person I was with in my first two kids are stupid posts (which feels like an eternity by now) is really into cars. He always asks about how cars function and is really into Tesla's. Last Friday, he asked another question about cars, and contradicted that with another thing, which is the main focus of this post. He asked "How do cars carry so much weight?" which was reasonable for him to ask. Then he said "Do they put poop in the cars or something?" we both laughed for a while after that, since we both knew that was kind of stupid. Then, he tried to hide that by saying that would be a new invention when he grew up. He knew it would smell terrible, but it would carry the load at least. Imagine driving in a car that's main source of weight is poop.