Hello! Ready for a quick and fun visual challenge? Look closely at this dense illustration. Your eyes are probably drawn to all the green. It's a forest of different cacti. Big ones, small ones, round ones, and prickly ones. It seems to be nothing...

Have you ever walked into a room, looked at a couch, a chair, or even a clean patch of carpet, and just plopped down without thinking? We all do it. Sitting is so second nature to us that we...