Let’s be clear: Humans are problematic as workers. First of all, they’re expensive, and they only get more so. On top of their basic wage, they cost their employers a third again more in payroll taxes, paid time off, health insurance, 401(k) contributions, and other perks. Think that’s all? Ask any facilities manager. Humans need ergonomic workspaces, heat, and light. Plumbing. All this is expensive, but it gets uglier. Ask any corporate counsel if humans like to bring lawsuits. Ask any security officer if embezzlement happens. Ask any inventory managers if they know about shrinkage. Ask any human resource executive what percentage of employees are engaged in their work (the average is 13 percent in the U.S.). But the trouble with human workers is a bigger deal than even that. Technologies get smarter and cheaper all the time, but humans as a group don’t. You can’t simply download preexisting knowledge to a human. Every human starts at square one.