How a rogue Wikipedia editor credited Muslims with... everything

I am teaching a fun, 6-week, non-credit course on the search for intelligent life among the stars, offered (by zoom or in person) through the San Francisco State University Osher Lifelong Learning Institute, starting Sept. 30.  It’s part of a program of courses for retired people, so if you are younger, perhaps you can pass […] The post A Course on Aliens in Science & Science Fiction for People Over 50 appeared first on Andrew Fraknoi - Astronomy Lectures - Astronomy Education Resources.

How do you tell friend from foe in a split second? These beautifully designed WWII guides used silhouettes and vehicle details into a system for recognizing tanks, planes, and ships on sight.

Regular readers may recall that I put a visit to Tulainyo Lake on my bucket list a few years ago. Last week I did it. Impossibly remote, otherworldly beauty, and an enduring mystery. Just how deep was this lake? Wikipedia claims not to know. Measuring it is non-trivial. A worthy challenge. The skinny: This relatively small alpine lake is about 117 m deep! That makes it the 25th deepest natural lake in North America, and by far the deepest lake on Earth for its size. Enjoy our interactive report here.