Truth: during the middle ages doctors believed that disease was caused by miasma, or "bad air," and that by breathing it in could cause illness.
Fact: Disease was caused by microorganisms, which spread by vectors such as insect bites, coughing and sneezing, and contaminated drinking water, among others.
I'm t̶̘̪͉̎̋̚̚h̴̛̤̹̝̞̆̆̇e̵͍̽̂͠s̸̡͍̹̖̔̓́e̶̚͜ ̴̢̘͕̼̽̓͘á̴͎͍͠r̴̡̦͋̊̒̃ę̸̗͓̖̿̈́̽ ̴͚̂͠t̸̡̯͔͌̀͝h̵̖͕̀̑̕ȇ̷̫͉͈̹͊̆͝ ̶̟͗̅̃̄f̵̦͕̻́̀̊͝i̸̡̯̘̓̒n̷̙̜̄͊̊g̵̠̊̽e̴̥̙̽ṙ̷̜̌͘s̶͕͆́ ̷̡̜̰̊Ỉ̶̯͙͔͝'̴̨̡̙̺̾v̸̱̦͔̰̂̎ȩ̶̝̂̌͝ ̸̬̗̭̍͝a̷͔͇̍͒̎͂ŝ̴̭͈̬͐̅͝š̶̜̭̙͝i̶̜̋̂̍͝m̵̹̫̬̥̏̄͐i̵̡̢̬̥̒͑͝l̵̜͖̓a̵͚̼̟̾̀̀͋t̴͎̄͒e̷͈͗͘d̷̨͖̟͛̂ years old today.
Archaic example.
Truth: during the middle ages doctors believed that disease was caused by miasma, or "bad air," and that by breathing it in could cause illness.
Fact: Disease was caused by microorganisms, which spread by vectors such as insect bites, coughing and sneezing, and contaminated drinking water, among others.