The scientific method, light microscope, germ theory, antimicrobials, and sanitation collectively doubled human lifespan from the late 1800s to the late 1900s.

“so again this is something you know we take for granted today but this idea that you would make an observation which is what science is All About You observe something around you you observe something in the natural world you form a hypothesis about why it is happening you design an experiment that is equipped to test the hypothesis you conduct the experiment and measure the outcome and you compare the results of the experiment to the prediction of the hypothesis and that is effectively the framework for what science is and so with that as the scaffolding upon which people could begin to make inference you now layer on on some other remarkable discoveries and insights so a creation of the light microscope the Advent of germ Theory and ultimately the development of antimicrobial agents all of these things collectively I think I would add to that just the practice of Sanitation led to a remarkable change in the trajectory of human lifespan”