Why does Covid come in waves?

Will loud music deafen my dog? Why are some dog breeds more docile than others? Why do Covid-19 outbreaks follow cycles of boom and bust? What gives a person their "second wind"? Why do ants invade my kettle and other electronic devices ? Is ant invasion in you home a sign that the place is dirty? Why have I got vibration sensations in my foot? Join Dr Chris Smith and 567 Cape Talk's Saskia Falken to find out... Like this podcast? Please help us by supporting the Naked Scientists