How can i know reality even exists?

How can I know that reality even exists if anything we think we know is just based on nuerological impulses. @ one time people KNEW the world was flat & burned people alive for suggesting otherwise. Dr. Igmund Semmelweis made groundbreaking discoveries in the medical field by discovering the reduced rate of... show more How can I know that reality even exists if anything we think we know is just based on nuerological impulses. @ one time people KNEW the world was flat & burned people alive for suggesting otherwise. Dr. Igmund Semmelweis made groundbreaking discoveries in the medical field by discovering the reduced rate of infections that occured in medical facilities that made frequent use of antiseptics; he was the first person to theorize the existence of these tiny microscopic "bugs" that got into your body & made u sick, called "germs"; they locked him up in a nuthouse, beat him w/ in an inch of his life & he died 2 weeks later. Now, anyone who doesn't believe in germs is crazy.
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