Typoglycemia. One mroe roasen taht hunmas win oevr mncaehis. Of course, I uesd a cuotmepr pagrrom on the web to scamlbre tihs txet, but I’m not dmub, jsut lzay. 
If you could still read the above passage, check out Typoglycemia. The basics of it are that as long as all the letters are there and the first and last letters remain the same, readers will have little trouble reading the text.
Pretty cool!