If you are just going to verify the info, why not just find out yourself and save yourself some time?

Leaded gas is still used in small airplanes with internal combustion engines. If you live near a General Aviation airport you are being showered in lead so some rich guy can play pilot.

They knew you could, but mostly didn’t because it takes a ton of energy to boil off water. There was no petroleum, no coal, so you would need a bunch of wood. So you use a bunch of wood to boil a liter of ocean water and you would get about 35 grams of salt. It just wasn’t worth it.