How are people taught if they are born blind and deaf?

I can understand trying to teach someone via visuals or by talking to them but I can't figure out how you would teach someone multiplication or about government services or scammers without either.

https://kbin.social/m/nostupidquestion[email protected]/t/159338

How do you dial in new coffee?

I would like to see what others are changing when you start a new bag of coffee. I will preface that I only do pourover....

https://kbin.social/m/[email protected]ld/t/146265