Walking barefoot on hot stones; what makes bluebirds blue
1974, Spiral Reaction: "Spirals of chemical activity form in a shallow dish of red reagent. A blue ring was induced by touching the surface of the solution with a hot filament, then the dish was rocked to break the ring. The free ends of the fragmented circular wave each curl around a pivot point, winding up into spirals." Photographs were taken over eight minutes. 1974 Pleistocene Humans Found in Ukraine "The systematic study of Pleistocene humans was first focused in France. Yet the first occupation sites to be discovered in central and eastern Europe, many of them spectacularly rich, were unearthed almost as long ago. The information they contain is vital to understanding how early humans survived and perhaps even thrived under ice-age conditions in Europe, perhaps best demonstrated by nearly 100 Pleistocene sites in and around the Ukraine. The earliest sites are between 80,000 and 75,000 years old." On supporting science journalism If you're enjoying this article, consider supporting our award-winning journalism by subscribing. By purchasing a subscription you are helping to ensure the future of impactful stories about the discoveries and ideas shaping our world today. 1924 Walking Barefoot on Red-Hot Stones "In some parts of Asia the priests, in order to show their magical powers, walk on red-hot stones spread over a fierce fire, without any protection to their feet. This achievement has always puzzled scientists. Many times the feet have been closely examined and have…