Cool story! Make Nature Identification global!
(re: A Mammuthus columbi (Columbian Mammoth) molar, found in a sandpit in Nebraska.The discoverers told their friends about it, who happened to be my old roommate's family, who told him, who told me about it- through that convoluted chain this (and several other) pictures were sent, allowing me to identify it for them. Photo used with their permission.")