Day 2 of YC S’17 brought us autonomous store checkout, cannabis genomics and at-home fertility testing. We whittled down the strong day of pitches to just seven hot companies. These are the startups our writers and the investors we spoke with were most excited about. If you want to check out the full list of startups from day 2 you can read about them here.

Additional reporting by Ryan Lawler and Katie Roof.