Since the game’s early days, baseball mythology has been constructed — often deliberately — to set itself apart. But sometimes things happen that demonstrate otherwise, and reality pokes through.

U.S. health officials on Friday endorsed the first blood test that can help diagnose Alzheimer’s and identify patients who may benefit from drugs that can modestly slow the memory-destroying disease.

So it’s no wonder that McDonald’s serves a supersized number of customers: more than 63 million a day in over 38,000 locations around the world. That’s a lot of burgers and french fries. All that foot ...