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I'm reading Randall Munroe's book How To: Absurd Scientific Advice for Common Real-World Problems. I probably don't have to tell you this, but it's awesome (as is everything from Randall Munroe, the creator of xkcd comics). The whole idea of the book is to go use some crazy ideas to solve mostly common problems. One chapter focuses on how to cross a river. He gives you lots of options. You could change the course of the river or even evaporate all the water in the river (both ideas are silly and fun). Another option is to use a kite to get across the river. And here is the fun part—Munroe...

To revist this article, visit My Profile, then View saved stories. While waiting for Reddit to load on my phone, I wondered if I could do some physics with the loading icon. Maybe you've seen it. It looks like a mini solar system with four planets (two inner planets and two outer planets). Let's model it! Video: Rhett Allain via Reddit We should start with some data. I can do a screen capture of the loading screen and then use my favorite video analysis program (Tracker Video Analysis) to get position and time data. Of course, the screen shows distance in units of pixels and that's not very ...