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.

Intuitively, we all know that when we see an image of an object, it could either be large and far away or small and close by. Only with a three-dimensional measurement can we actually know what's ...

The article explores the challenge of visually detecting variations in the Moon's apparent size, which are caused by its changing distance from Earth during perigee and apogee, amidst perceptual ...

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).