It’s a Crude World
The other day, I walked out and got into my car, which takes just plain old regular unleaded gasoline. I drove into town on the asphalt roads, which are a remarkable feature. They’re basically just crushed gravel and tar or pitch (bitumen, technically), which is one of the leftovers from refining oil, and they cover an impressive amount of the surface of the Earth at this point. Less than .1 percent to be sure, but that is still a lot of asphalt. Continue reading