Finally found this book on Amazon--it was my mom's old high school textbook and I read it so much as a kid that it literally fell apart. There were some really great stories in there that I want to use in my classroom, so I am psyched that I was able to track it down.
The Vonnegut story about everyone being equail is funny and chilling.
Asimov writes an essay about how he's the inventor of the robot code of ethics. It's great when a person inserts themselves into history citing themselves and the works they've created, just so that historians will get the record straight.
I enjoyed Robert Heinlein's story about an architect who builds a four dimensional house, a tesseract.
This was actually the textbook for my sci-fi English class. Contains some of my favorite science fiction short stories and writers. So many good stories in one book.