It's based on the mathematics of viral spread. If 1 person infects 10, then those 10 infect 100, then those 100 infect 1,000, then those 1,000 infect 10,000, then those 10,000 infect 100,000 and so on. Exponential growth. This outbreak is teaching us a lot of things, including how deficient math education is in the US. Or maybe just on this forum.
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The thing is, viruses don’t spread exponentially, unchecked, forever. Branching slows to a stop due to a variety of factors as the population becomes less susceptible. Couple that with mutations and immunity development and it also can become more or less lethal and/or more or less transmissible.
It’s also teaching how deficient basic science education is in the US.