I often search for this to find a site dedicated to hosting a definitive list of problems that can be filtered by category and sorted by order of how many people’s lives would be improved – ideally each problem would contain a list of different projects where people are trying to solve the problem. that would help them get in touch with each other, see progress made and allow each to know which bit of the problem still needs a solution. Why this doesn’t exist. I don’t know. Maybe it does. For now I am linking to one of the usual posts that list problems that should be on a site like this.