Neat things I learned about Fuel
There's special diesel for Agricultural use
Maybe it's not accurate to say that the diesel is "special". Really the only difference is that red dye is added to agricultural use diesel. Ag Fuel is cheaper because farmers are not charged the road taxes that accompany over-the-road fuel. Don't get caught running agricultural use fuel in your pickup though—it's surprisingly serious.
There are specialty lubricants for everything
Having worked on cars and bikes and things that need lubricants, I thought I knew a bit about it. The amount of specialy lubes for things like food-safe applications for all manner of food processing equipment; chainsaw bar lube that minimizes spark and keeps the chain from flying off; turbine oil for the stresses caused by the constant rotation of wind and water turbines... the list is endless.