Summertime overflows with youth sports, adult pickleball leagues, and leisurely days spent sweating under the summer sun. All that heat and activity makes us thirsty, and it makes us wonder about electrolytes, too—how many we’re losing, how many we need, and how to replenish those that we’ve lost. Electrolytes began to enter the national consciousness…

Commercial influences may have corrupted the American College of Sports Medicine’s hydration guidelines. If you had to name the greatest medical advance over the past two centuries, what would you pick? Smallpox vaccine jumped to my mind, then I remembered it was discovered back in the 1700s. The British Medical Journal compiled a list of 15 contenders, but…