Until we break a bone or two, we tend not to spend too much time think­ing about our bones, where they come from, and how we know what we know about them. Well, today we’ve got a bone to pick with our own skele­tons. We’ll talk with Bri­an Switek, author of the book ​“Skele­ton Keys: The Secret Life of Bone”, about where your skele­ton comes from, and how so many of the skele­tons sci­en­tists have stud­ied have com­pli­cat­ed pasts and uncer­tain futures.