Food, lifestyle, exercise and especially sleeping well are absolutely critical and Americans in particular do a terrible job here

You're right . 100%!

And sometimes a dangerous bug comes along and kills millions, like the Spanish flu, polio, smallpox or typhoid. Sometimes a vaccine can help.

In our hyper connected world these germs and viruses can spread instantly, globally.

mRNA may sometimes be the only fast answer. They can simulate human trials in an AI and get a vaccine in days rather than years.

What if the next COVID-19 has a 50% mortality rate?

Good diet only helps so much