I’d like to share two fun and hopefully educational physics examples with applications to precision measurement. The first is a recent paper about sending radio data with almost no power (arguably negative power). No this doesn’t violate the second law and is closely related to the sensitivity of CRES and radio telescopes. The second is a qualitative understanding of how optical combs work. Optical combs are crucial for detecting planets around nearby stars and are the basis of optical atomic clocks. In addition their quantum mechanics is lovely with non-continuous wavefunctions in both time and energy. So bring your thinking caps and we’ll talk about some fun physics.