We all have a few go-to calculations that we find ourselves doing often, like converting ounces to cups or miles to kilometers—that sort of thing. When I need to do a quick conversion, I use ...

Our blue sphere: a photograph of Earth, taken by the Apollo 17 mission. (Courtesy: NASA) In case you were not convinced by our immensely popular article “Fighting flat-Earth theory” by Rachel Brazil, ...

Math whiz Wim Klein, born a century ago, moved physics forward with his calculations as computer developers worked to catch up with him. An audience member yelled: “35, 27, 42, 41.” Wim Klein chalked ...

Physics and Python stuff. Most of the videos here are either adapted from class lectures or solving physics problems. I really like to use numerical calculations without all the fancy programming ...