On April 15, 2019, the world watched in transfixed horror as a fire ravaged the famed Cathedral of Notre Dame in Paris, collapsing the spire and melting the lead roof. After years of painstaking restoration costing around $740 million, the cathedral reopens to the public this weekend. The December issue of National Geographic features an exclusive look inside the restored cathedral, accompanied by striking photographs by Paris-based photographer and visual artist Tomas van Houtryve.

For several hours, it seemed as if the flames would utterly destroy the 800-year-old cathedral. But after a long night of work by more than 400 Paris firefighters, the fire finally began to cool and attention began to shift to what could be salvaged and rebuilt. French President Emmanuel Macron vowed to restore Notre Dame to its former glory and set a five-year deadline. The COVID-19 pandemic caused some delays, but France nearly met that deadline regardless.

Those reconstruction efforts were helped by the fact that, a few years before the fire, scientist Andrew Tallon had used laser scanning to create precisely detailed maps of the interior and exterior of the cathedral—an invaluable aid as Paris rebuilds this landmark structure. French acousticians had also made detailed measurements of Notre Dame's "soundscape" that were instrumental in helping architects factor acoustics into their reconstruction plans. The resulting model even enabled Brian FG Katz, research director of the National Center for Scientific Research (CNRS) at Sorbonne University, to create a virtual reality version of Notre Dame with all the acoustical parameters in place.

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© Tomas van Houtryve for National Geographic

"Am I the first person to discover this?" is a tricky question when it comes to classic Macs, some of the most pored-over devices on the planet. But there's a lot to suggest that user paul.gaastra, on the 68kMLA vintage Mac forum, has been right for more than a decade: One of the capacitors on the Apple mid-'90s Mac LC III was installed backward due to faulty silkscreen printing on the board.

It seems unlikely that Apple will issue a factory recall for the LC III—or the related LC III+, or Performa models 450, 460, 466, or 467 with the same board design. The "pizza box" models, sold from 1993–1996, came with a standard 90-day warranty, and most of them probably ran without issue. It's when people try to fix up these boards and replace the capacitors, in what is generally a good practice (re-capping), that they run into trouble.

The Macintosh LC III, forerunner to a bunch of computers with a single misaligned capacitor. Credit: Akbkuku / Wikimedia Commons

Doug Brown took part in the original 2013 forum discussion, and has seen it pop up elsewhere. Now, having "bought a Performa 450 complete with its original leaky capacitors," he can double-check Apple's board layout 30 years later and detail it all in a blog post (seen originally at the Adafruit blog). He confirms what a bunch of multimeter-wielding types long suspected: Apple put the plus where the minus should be.

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© Doug Brown