"We haven't figured out how to use all of them yet.." I would modify this a little with the following: "We haven't figured out how to use all of them yet or we

"We haven't figured out how to use all of them yet.." I would modify this a little with the following: "We haven't figured out how to use all of them yet or we don't want to use all of them yet..." Hero of Alexandria, for all practical purposes, discovered the use of steam power, but because labor was so cheap, it was never pursued.