It affects every aspect of our lives from the moment we are born, to the food we eat, the cars we drive, and the medicines we take. This object has helped send men to the moon, and satellites into space. It is an object unlike any other, the last of its kind. A literal constant in an ever-changing world, and the weight by which all others are measured. The Last Artifact follows the high-stakes race to redefine the weight of the world, and reveals the untold story of one of the most important objects on the planet: the kilogram.