As new coronavirus variants come onto the scene, it forces us to revisit what we know about COVID-19 and how to deal with it.

We already know the Delta variant is more infectious, but is it more deadly?

Early data from overseas, and from Australia on ICU admissions imply that it is - but knowing for sure may take a bit longer to know.

Also on today's show:

* Say you got the vaccine and then 30 seconds later, a shark bit off your arm. Would the vaccine still be effective, or does enough of the vaccine stuff happen in your arm itself that you'd need another dose?