You can thank the guys toiling in this pictures for the fact that you don’t have to change your tires very often: They’re mining sulfur, which is mainly used to vulcanize rubber and make it more durable.
Every 19 gallons of petroleum we refine leaves behind a half pound of sulfur byproduct—far more than we can even pretend to have use for. Luckily, some ingenious researchers at the University of Arizona, may have devised a solution that transforms the rancid yellow element into a new breed of battery.
The sulfur in your match head comes from the earth just like any other ore. However, most other minerals aren't still excavated by hand. From the edges of giant acid pools.