My Kids Were Swimming at the Beach When a Stranger Suddenly Screamed, “Get Out of the Water!” Then I Learned What a “Square Wave” Really Is…
My teenage kids went to the beach with a few friends that afternoon. It was supposed to be an ordinary day: sunshine, warm weather, plenty of people around, and the kind of waves that make teenagers want to stay in the water for hours. When they came home later, however, they didn’t talk about the … Read more