My personal fascination with the power of the crowd has been growing: Exactly what can a 'crowd' accomplish? We know crowds can raise billions of dollars, create Wikipedia, and even design and build small autonomous drones. But how about something large and complex like designing a new car, and maybe someday even a spaceship?
It used to be that, in astronomy, a small team of people could look at photos of a few thousand galaxies and classify and catalog them relatively easily. But now, with a new generation of robotic telescopes scanning the skies constantly and producing millions of images, that's become next to impossible.