I'm a computer scientist, in college I had a (basic) telecommunications course. I've found it interesting, but had afterwards no opportunity to use apply it professionally, which is of course not surprising. However, once in the aftermath of a class, the professor posed a question to ponder:
"How do you think it is possible for a cell carrier to exactly deliver the signal to your phone, even when sitting in a bus with 50 other cell phones around and moving on the highway with high speed?"
Unfortunately, we never got around to obtaining the answer. I've often thought about it for the past few years, but came to no answer. Can someone help out?