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01 ·Fabrication & Packaging·★ MEMBER·10 min read EUV Lithography — The Madness of Making 13.5nm Light Light at 13.5nm is absorbed by air and by every lens material there is. So why did the semiconductor industry build an entire industry around it? Tin plasma sources, optics with no lenses at all, and the cost arithmetic against multi-patterning — explained from zero. 02 ·Fabrication & Packaging·★ MEMBER·9 min read How Chips Are Made — From Wafer to Yield Every GPU and phone processor starts as sand and passes through hundreds of printing steps. From the basic moves — lithography, etching, ion implantation — to the brute force of EUV and the yield math that makes big dies exponentially expensive, explained from zero.