Just want to say: Dominic Cummings... what a douche!
I like that simulator reexre. I wouldn't put too much stock into the results (in fact, they tell you not to, that's not what it's for) but it does give a very good demonstration of the basic principles and highlights why measures like the lockdown are so important. If you want to see a particularly sobering example, leave the social distancing turned down and watch what happens when the hospital reaches capacity.
