Question: If you could create a machine that could do one thing , what would that one thing be?

Kristian Harder answered on 15 Nov 2013:

Oh, there are soooo many things on this planet that need to be improved:
– better batteries for storing electric energy either from solar panels or in cars
– improved technology for detecting and disabling weapons
– green technology reducing the amount of waste and pollution we create
– more money in my wallet
But here’s something I’d really like to invent to make my life much easier on the short term:
– a good system for maintaining multiple parallel to do lists with varying
priorities, deadlines, dependencies, recurring tasks and so on.
Amazingly, even after looking very hard I haven’t found anything that can do all that and is easy to use.
Not sure whether that would be a world-changing invention, but I do think it’s something important. 🙂