judgecorp writes "Millions of Britons have lost access to Ceefax, the real time information service that has piggy-backed on blank lines of the analogue TV signal since the 1970s. Analogue TV is being switched off, and the low-res news service looks like going with it." Link to Original Source
"I think it is true for all _n. I was just playing it safe with _n >= 3
because I couldn't remember the proof."
-- Baker, Pure Math 351a