Have you ever wondered why the night sky is dark? Space or arrow keys or swipe
I read about Olbers's Paradox in Labyrinths of Reason. I like Olbers's Paradox because it asks you to look away from the bright & obvious, to consider the absence of stuff, as something wondrous itself. It's a lesson in problem-solving, in considering all the different ways of finding an answer. Like how you can learn so much about the stars by only looking away from them. I wonder what other problems are out there to be solved by considering lack.