Can lions yawning in the wild translate to a human’s reason for yawning? Is yawning and other habits we have like touching our face, contagious when we’re hanging out in groups? Then in Dental School 101 the Dr. has insider info about how bad bacteria can get, when it sticks to your invisalign trays, whitening trays, retainers, and mouth guards. What is the proper way to clean these devices to avoid bacteria build up and device deterioration? Hear the tips! In the latest Covid-19 update, we have a progress report on the virus variants and recent virus spikes. Plus, what fake news is out there that you need to ignore.