** More on nonprofits that joined YC (80,000 Hours, Centre for Effective Altruism) ✔
** Imagine K12 ✔
** Rows for competition? i.e., other startup accelerators that have similar models, or models that are different in some key ways
** Y Combinator's release of application videos ✔ at https://www.ycombinator.com/video/ and there's also a fuller list at https://mittalrohit.com/59-links-for-y-combinator-application-and-interview-advice-bf90191be8ed
** '''I included a row for each school batch except the ongoing Winter 2019. I think I named all the non-profits. I named also the top rated YC companies according to valuation [https://www.ycombinator.com/topcompanies/], and others with article on Wikipedia'''.