If you’re feeling jittery about where the country is going, there’s good news on the personal front.  The link between physical exercise and mental acuity is real. (“Ask the Brains,” Scientific American Mind, Sept/October 2016, pg.72.)  As we already know, the brain requires

I wrote, recently, about a dress that appeared to be blue and black to some people but gold and white to others. (Blog 7/17/2015) Initially, the cause for the difference in perception was charged to how light waves hit the retina. But, not so fast. Other researchers suspect the differ