The December 2022 issue of IEEE Spectrum is here!

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The 90-meter-high piece of graffiti scrawled on the back of this office building in Rotterdam, Netherlands, was the product not of hundreds of aerosol cans but of Laser Tag, an open-source painting program from New York City�based Graffiti Research Lab. As an ordinary green laser pointer’s beam was drawn across the building, a sensitive low-noise camera (developed for astronomers) captured its movements and relayed them to a laptop running the software. Then a movie projector ”painted” the squiggles onto the multistory canvas in real time.

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The Transistor at 75

The past, present, and future of the modern world’s most important invention

2 min read
A photo of a birthday cake with 75 written on it.
Lisa Sheehan
LightGreen

Seventy-five years is a long time. It’s so long that most of us don’t remember a time before the transistor, and long enough for many engineers to have devoted entire careers to its use and development. In honor of this most important of technological achievements, this issue’s package of articles explores the transistor’s historical journey and potential future.

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