Two math ideas that I've tried to keep in mind on coronavirus:
1) Risk vs reward--Visiting the grocery store during off hours is definitely worth the risk. But using the Boston subway at rush hour is not.
2) Exponential growth--viruses expand fast--they double each period. So if we have X number of cases today, we don't go to 1.1X, then 1.2X. then 1.3X.... We go to 2X, then 4X, then 8X, then 16X..,. Pretty soon we're at 100,000+.
I think I'd visit Mr DaSilva in his shop or call on the phone
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