Robots like Apollo are seemingly everywhere these days. There are headlines about Chinese bots running half marathons, ominous videos of muscled humanoids twitching on gantries, clips of robot fight clubs. Sometimes you get the feeling that these machines constitute a fifth column of sorts—a not-so-secret cell, growing in number, biding its time, preparing for the uprising. Economists are looking forward to it. Around the world, they point out, population growth is slowing and labor shortages are spreading. Without humanoids to step into the breach, and quickly, the global economy could descend into chaos. Bank of America forecasts that there will be at least a million humanoid robots shipped annually by 2035, while Morgan Stanley predicts that more than a billion will be in use by 2050. If all goes according to plan, robotics could constitute the largest industry in the world, generating annual revenue upwards of $5 trillion. Elon Musk, that sage of understatement, claims that Tesla’s own Optimus robot will one day “be more productive than the entire global economy.”

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