The current revival of the American economy is being predicated on social distancing, notably the Six-Foot Rule of the CDC, which offers little protection from pathogen-bearing aerosol droplets sufficiently small to be mixed through an indoor space. The importance of indoor airborne transmission of COVID-19 is now widely recognized, but no simple safety guideline has been proposed to protect against it. We here build upon models of airborne disease transmission to derive a guideline that bounds the ``cumulative exposure time", the product of the number of occupants and their time...

This talk explores next steps in the search for new physics in the neutrino sector. The discovery of neutrino oscillations has changed the way we think about our model of particle physics. We must now incorporate tiny neutrino masses into our theory, as well as consider the possibility of other unexpected properties. You might ask what a tiny mass particle has to do with elephants? To learn this, you need to come to the colloquium.