 This study demonstrates how the quantum-electrodynamic coupling between a molecule and an optical cavity can be used to control the weight and stereochemistry of a deal's older reaction. By adjusting the molecule's orientation relative to the cavity's polarization, the researchers were able to either increase or decrease the reaction weight, as well as selectively favor one product over another. The researchers believed their findings could have applications in other areas of chemistry, such as click reactions. This article was authored by Farbejan Parvoavi, Robert L. Smith and Angel Rubio.