Guru's Tech Bytes — April 19, 2026
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Good morning. This is Guru's Tech Bytes, Ep. 016, for Sunday, April 19th, 2026. First up, scientists at NIST have built tiny photonic circuits that can generate lasers at essentially any wavelength you fancy. It's a fiddly bit of kit integrated directly onto a chip, and the implications for optical computing, precision sensing, and yes, future AI accelerators, are rather enormous. Second, Kotaku has a lovely piece where game developers explain the surprisingly gnarly engineering behind pausing a video game. Turns out freezing time is a lot harder than it sounds, especially when physics simulations, streaming audio, and network state all disagree about what "paused" even means. And finally, the Antithesis blog asks what skiplists are actually good for. The short answer is concurrent data structures without the hairy locking that tangles up balanced trees, and the long answer is a genuinely charming read for anyone who still finds joy in a well-designed index. That's your daily byte. Have a great day. Until next time. Stories covered NIST scientists create 'any wavelength' lasers — Hacker News Game devs explain the tricks involved with letting you pause a game — Hacker News What are skiplists good for? — Hacker News
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