It's YC S26 Demo Day tomorrow. Some of the wildest ideas in this batch: → @Atomarine_co .... floating data centers on barges at sea, cooled by seawater, aiming to run on nuclear ships. Their logic: grids can't expand fast enough, the ocean can. → @KaraLabsAI .... diamond semiconductors. Today diamond sits next to the chip to cool it. Their bet: tomorrow diamond is the chip. → @ParasmaAI .... training living human brain cells to compute. The founder got here via a project teaching neurons to play Doom. → @LambLabs .... hard-coding an entire AI model directly into silicon. Claiming 20,000+ tokens/sec in some configs. → @Locke .... AI for navigating government. Zero to ~$800K ARR in eight weeks, reportedly on track for $1M by Demo Day. → Axelrod .... AI-run hotels whose agents click through the ancient front-desk software the way a human would. Lack of APIs in hotels is the moat. → @Omantahealth .... a personal scientific R&D team for one patient. Started in oncology, chasing individualized treatment. → @Exosat_ .... a politically neutral, sovereign satellite network. The founder joined YC on the logic that if it lifted his odds of building a Starlink-scale company by even 7%, the equity was worth it. → @lumeriaskin .... at-home skin imaging. $100K+ in revenue in under 48 hours Two-person teams, most of them, pointing AI at tangible stuff - chips, oceans, satellites, biology. Say what you want about YC. This is not a batch of chatbot wrappers.