When I was a child, I always wanted to be a superhero. I wanted to save the world and make everyone happy, but I knew that I'd need superpowers to make my dreams come true. So I used to embark on these imaginary journeys to find intergalactic objects from planet Krypton, which was a lot of fun, but didn't yield much in the way of results. When I grew up and realised that science fiction was not a good source for superpowers, I decided instead to embark on a journey of real science, to find a more useful truth.