They never taught us about the tantalum rush of 1849. And the phrase "There's gallium in them thar hills." never really caught on.

I'd like to know the total amount of gold pulled out of the ground. (We'll never know for sure and I wouldn't report it if I did.) There's plenty of hobby gold seekers out there. Guys will spend days off panning streams, sandy beaches. Look into it if you're interested

And then you hear about asteroids with 100x these

How neat.

Good graphic