By the way, yesterday Elon Musk said that the mass production of Tesla's robots will be delayed because of China's ban on exports of rare earth magnets to the US in retaliation for Trump's ridiculous 145% tariff. Robots need those magnets because they need a lot of small but powerful energy efficient electric motors, and you can't make those without rare earth metals.
China accounts for well over 90% of the world's production of rare earth metals, and nearly all of the rare earth magnets. In addition to robots, a modern F 35 fighter jet has about 920 pounds of rare earth metals in it, and a Virginia class nuclear submarine has about 9,200 pounds, 10 times as much.
John K Clark See what's on my new list at Extropolis yyv