These ancient bones were all discovered. Henry Sadler, a middle school science teacher, found the humerus bone of a massive Columbian mammoth while diving in a river in Florida. In 2021, Italian archaeologists found the remains of nine neanderthals in a cave near Rome. In 2020, workers in Mexico digging the foundations for a new airport made a startling discovery: several woolly mammoth bones. Inside Edition Digital’s Andrea Swindall has more.