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Radio challenged newspapers in the early 1900s, and television challenged radio.
Now, it looks as though traditional television has its own competitor, but it's not one that's easily separated from television.
With broadcast TV, an antenna picks up radio waves to transmit pictures and sound to your television set.
With cable TV, wires connect to a set-top box or to your TV itself.
These wires run from your house to the nearest cable TV station, which acts as one big antenna.
Earning a degree if you're working (or simply busy) isn't as hard as it used to be.
The time, distance and financial constraints of higher education have all but disappeared with the arrival of distance learning via telecommunications and online technology.