The February 2023 issue of IEEE Spectrum is here!

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iCandy: Imitation of Life

Robots run, swim, act, and fight like us

1 min read

China’s first domestically developed space module equipped for laboratory experiments took off from the Jiuquan Satellite Launch Center in late September. The Tiangong-1 space module rode on the back of a Long March 2F two-stage rocket with four strap-on boosters. Over the next few months, the Tiangong-1 and modules from subsequent launches will be used to practice docking maneuvers in anticipation of the introduction of China’s space station.

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From WinZips to Cat GIFs, Jacob Ziv’s Algorithms Have Powered Decades of Compression

The lossless-compression pioneer received the 2021 IEEE Medal of Honor

11 min read
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Photo of Jacob Ziv
Photo: Rami Shlush
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Lossless data compression seems a bit like a magic trick. Its cousin, lossy compression, is easier to comprehend. Lossy algorithms are used to get music into the popular MP3 format and turn a digital image into a standard JPEG file. They do this by selectively removing bits, taking what scientists know about the way we see and hear to determine which bits we'd least miss. But no one can make the case that the resulting file is a perfect replica of the original.

Not so with lossless data compression. Bits do disappear, making the data file dramatically smaller and thus easier to store and transmit. The important difference is that the bits reappear on command. It's as if the bits are rabbits in a magician's act, disappearing and then reappearing from inside a hat at the wave of a wand.

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