3Blue1Brown goes into more of the math of SIR models — which drive many of the simulations you’ve seen so far — that assume people are susceptible, infectious, or recovered.
Simulating an epidemic
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Counting the Hours
Every day is a bit different, but here is a wideout view of how Americans spend their days. Compare with your own time use.
Saving for Retirement and Age
People tend to have more money saved up over time, but range and variation also grow, and often it’s not enough.