...The Machine Stops is worth a read and available for download here.
Meant to say thanks for this link. I had been looking for E.M.Forster's classic just recently - for my daughter actually. The link you provide is great, as it can give you a copy in several formats and for several different reading devices.
I was well into reading SF from the age of 9 or so, but I think I first met The Machine Stops
as required reading in Eng.Lit. at secondary school. It is an excellent SF short story.