That's alright, we used to have an old manual typewriter at our house, and we eventually phased it out with a computer. However, I remember one day when I was in middle school (I think 7th grade) when I went into one of the back rooms in the library to get a reference book and I noticed an IBM electronic typewriter...

Later that year, one of the clubs I was involved in (Model UN) had to send out forms and such for a conference, so our advisor asked if I would type up the envelope. I must've wasted three or four envelopes before someone told me that electronic typewriters have a delete function.