The host explains the role of an archaeologist: to study human history. She explains the difference between archaeologist and paleontologists and describes the work that archaeologists perform, including how they determine where to look for artifacts.
Charlie explains radiocarbon dating and how it is used to calculate the approximate age of an object. To make his explanation more concrete, he uses an analogy involving a refrigerator and the number of ice cubes in it.
Don talks to a scientist who helps him understand that the victim had been trying to find the ancestry of the skull. They use equations to calculate where the cheekbones and nose would have been to determine the origins of the artifact.