I find everything about it interesting. The history of it, the mechanics of it. How it has evolved from a very primitive system to a miraculous worldwide communication system. How it has affected people and our culture and business world.
And I'm not even talking about cell phones, although those hair their own interesting characteristics.
I mean, just pause and think for a moment what the world would be like without telephones connecting us all. That if I know the right digits to dial, I can talk to the President of the USA....or Russia, or pretty much anyone else on the planet, instantly!
That capability simply didn't exist 120 short years ago. Even calling anywhere in the USA wasn't an easy feat 90 years ago.