When I watch the World Cup, I always think about set pieces. This is when the ball is placed at a certain spot and a team is allowed to then kick the ball (called a free direct kick). If this kick ...

You know I like to use pictures for data from time to time, right? One problem is that I don't know much about cameras. There, I said it. Really, almost all of my photos are made with my phone. That ...

I dabble in digital photography-- over at my other blog, I'm doing a photo-a-day project-- which means that, like a lot of amateur photographers, I've acquired a collection of lenses of various types.

THE existence of a source in the Crab Nebula with an angular diameter of less than 1 sec of arc has been revealed by observations of interplanetary scintillation at a frequency of 38 Mc/s (ref. 1).