I've been fascinated by this for years and years. I've known about thorn, but I didn't know about eth and how thorn and eth are pronounced differently.
FTFY :)
"English hæs alƿays been a living languæge, changing and evolving wiþ use. But before our modern alphabet was estæblished, ðe languæge used many more charæcters ƿe’ve since removed from our 26-letter lineup. ðe six ðæt most recently got axed are:"