It was exciting to watch O-REX gather a sample from asteroid Bennu. One way OREX will determine how much sample was collected is by spinning the spacecraft and calculating the change in its moment of inertia before and after collection — a great basic physics experiment that I use as an example in my introductory physics class. The PI of OREX, Dr. Lauretta, got his Ph.D. at Wash U working with Dr. Fegley in EPS!