A Fitbit for cows, USB ports for bionic limbs, and microbatteries were amongst the most promising companies of the 52 that launched at Y Combinator’s winter 2017 Demo Day 1 yesterday. After asking investors their favorites and huddling with the TechCrunch team, here are our picks for the top 7 startups. Click through/scroll to learn about each. You can read our full coverage of all… Read More