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Q&A with Simile CEO Joon Sung Park on claims that its digital twins predict human behavior with 85%+ accuracy, its goal of simulating all 8B people, and more (Mario Gabriele/The Generalist)

Inside Simile with Joon Sung Park. … Before Joon Sung Park and I had ever met, he simulated the conversation.

We haven't written up this one. Techmeme has the full story — the link below goes straight to it.

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Vector and Web Retrieval for Changelog Trackers: A Recoverable Design

Short answer: use staged retrieval for a developer changelog tracker: query a bounded vector collection first, use web search as a time-boxed fallback, and return source context with every answer.

  • Vector search prioritized for indexed changelogs, with web search as fallback
  • Canonical records maintain stable source IDs and hashed content for recoverability
  • Retrieval includes traceable context like collection name, record ID, and source URL

How I check whether a "no upload" PDF tool really keeps my file local

Lots of PDF and image sites now say "your file never leaves your device". Some of them mean it, and some run the work on a server anyway.

  • Open browser's Network panel to inspect upload requests.
  • Check Headers for POST/PUT method and Request URL.
  • Verify file sent as form data in Payload section.

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