Custom Printing

A desktop 3-D printer builds plastic objects layer by layer

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Interview with George Dyson

The historian of technology discusses the remarkable story that inspired his latest book, Turing’s Cathedral.

Six Strange Things Worth Money Online

What’s a tweet worth? The Web is redefining what’s valuable and letting people create personal wealth in surprising new ways.

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The Technomagic of Sphero

Wireless battery charging and remote control via a Bluetooth-based smart-phone app gives this robot toy its appeal.

Rolling, Rolling, Rolling ...

A toy ball moves under the command of a smart-phone application.

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Small Gains

Wind and solar power are ­ramping up quickly, but the world’s demand for electricity is growing much faster.

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The Other Side of CES

Every January, up to 150,000 people swarm the ­Consumer Electronics Show in Las Vegas, where they mainly see salesmen and models touting slick gadgets under bright lights. Most visitors miss the ­surprises that can be found in a plain corner called the “International Gateway,” where manufacturers from Asia display unglamorous components and offbeat items.

Photographs by Gregg Segal

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Tesla's New Car: A Luxury SUV, with Wings

The Model X will help Tesla compete better with large automakers.

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