There are three big things that I believe are worthy of dedicating significant time. The first is cryptocurrency and critically the application of it to the betterment of society. The second is energy, particularly fusion technology. It is hard to overstate how much good that could do in the world. The last one is space. The intrepid exploration of our place in the universe and the pace at which that is currently evolving today is invigorating. I'm working on the first one right now but the other two are super tempting!