For the human race: Safe water, war, climate change, and better access to space are probably on the list. The insane US political climate might be up there, too.
For us on HN: Anything that you can do to make a dent in any of the above problems. Also, internet security is completely broken and needs a total re-think and re-do. We need safe access to the world's information for the several billion people who are not yet online. (For that matter, we need safe access for everyone else, too.)
For the human race: Safe water, war, climate change, and better access to space are probably on the list. The insane US political climate might be up there, too.
For us on HN: Anything that you can do to make a dent in any of the above problems. Also, internet security is completely broken and needs a total re-think and re-do. We need safe access to the world's information for the several billion people who are not yet online. (For that matter, we need safe access for everyone else, too.)