The insecticide DDT was introduced in the 1940s, and originally thought to be safe for people and pets. It was marketed with happy cartoon characters and family-friendly products, but, as we eventually discovered, the poison was bad for people and animals, too.
Clyde Tombaugh, a Kansas farmer, loved astronomy, and cemented his name in history by discovering Pluto. Here’s how he found it.
The “hex marks” painted on the old barns of the so-called Pennsylvania Dutch farmers, even on some of the modern new barns, now are merely traditionally ornamental.