You know how much I love photography, particularly beautiful images that appear, at first glance, to stretch way beyond the limits of cameras, shutter speeds and physics.
The image to the right is one of 50 gorgeous fractal flames -- algorithmically generated images and animations -- displayed at the TechRepublic site.
Just don't assume, however, you have to be steeped in computer savvy to create such objects yourself. These images were created with Apophysis, a free Windows application you can learn to master as well.
Consider it just one of the many enjoyable ways at your disposal to challenge your brain and keep it sharp.