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THE MAKER MOVEMENT is a global community of inventors, designers, engineers, artists, programmers, hackers, tinkerers, craftsmen and DIY’ers—the kind of people who share a quality that Rosenstock says “leads to learning [and]…to innovation,” a perennial curiosity “about how they could do it better the next time.” The design cycle is all about reiteration, trying something again and again until it works, and then, once it works, making it better. As manufacturing tools continue to become better, cheaper and more accessible, the Maker Movement is gaining momentum at an unprecedented rate. Over the past few years, so-called “makerspaces” have cropped up in cities and small towns worldwide—often in affiliation with libraries, museums and other community centers, as well as in public and independent schools—giving more people of all ages access to mentorship, programs and tools like 3-D printers and scanners, laser cutters, microcontrollers and design software

In a handful of laboratories around the world, computer scientists are developing robots like this one: highly programmed machines that can engage people and teach them simple skills, including household tasks, vocabulary or, as in the case of the boy, playing, elementary imitation and taking turns.

NEW forms of media have always caused moral panics: the printing press, newspapers, paperbacks and television were all once denounced as threats to their consumers’ brainpower and moral fiber.

Experience does not revamp the basic information-processing capacities of the brain. Speed-reading programs have long claimed to do just that, but the verdict was rendered by Woody Allen after he read “War and Peace” in one sitting: “It was about Russia.” Genuine multitasking, too, has been exposed as a myth, not just by laboratory studies but by the familiar sight of an S.U.V. undulating between lanes as the driver cuts deals on his cellphone.

And to encourage intellectual depth, don’t rail at PowerPoint or Google. It’s not as if habits of deep reflection, thorough research and rigorous reasoning ever came naturally to people. They must be acquired in special institutions, which we call universities, and maintained with constant upkeep, which we call analysis, criticism and debate.