Vox explains efficacy rates and why the best vaccine is the one you get now:
Vaccine efficacy rates explained
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Peak Non-Creepy Dating Pool
Based on the “half-your-age-plus-seven” rule, the range of people you can date expands with age. Combine that with population counts and demographics, and you can find when your non-creepy dating pool peaks.
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.