Meet the "ems" -- machines that emulate human brains and can think, feel and work just like the brains they're copied from. Economist and social scientist Robin Hanson describes a possible future when ems take over the global economy, running on superfast computers and copying themselves to multitask, leaving humans with only one choice: to retire, forever. Glimpse a strange future as Hanson describes what could happen if robots ruled the earth.

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