The Grey Labyrinth is a collection of puzzles, riddles, mind games, paradoxes and other intellectually challenging diversions. Related topics: puzzle games, logic puzzles, lateral thinking puzzles, philosophy, mind benders, brain teasers, word problems, conundrums, 3d puzzles, spatial reasoning, intelligence tests, mathematical diversions, paradoxes, physics problems, reasoning, math, science.

Jack_Ian · Big Endian

I didn't want to create a thread just for this single image, so perhaps this will grow with links to other interesting images.

The photographer went through a lot of effort preparing for this image, but I think it was worth it. He had to time it perfectly. The transit only lasted half a second.

Quailman · His Postmajesty

I change my wall paper every so ofter to something interesting from Astronomy Picture of the Day.