Smart mattress covers, RNA diagnostics, and photosynthetic grow lights were among the big ideas that shone brightest on stage at Demo Day 1 for Y Combinator’s Summer 2015 batch. Fifty startups presented on the record, including a massive influx of hardware companies and biotech firms. You can read about all of them here.

Click through to see TechCrunch’s picks for the top 9 startups from the day.

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