Arduino Factoids Please

Hi All,
I am teaching an Arduino class to pupils age range from 10-12.

As part of introducing them to the Arduino so that they can get to know it and what it does, I like to start the class with a couple of facts.

anyone who can pitch in with some - that would be great,

for instance, information about the chip, or where else it is used, what is also on the board, for instance the timer chrystal and what that does.

Where Arduino are (if) used in industry or products, Interesting places arduino's and ATMega328's have been used.

etc..

Thanks in advance.

jon

Please don't crosspost.
https://forum.arduino.cc/index.php?topic=349978.msg2414794#msg2414794

Topic locked.

(arrg, IE11 and the forum don't get along - sticking extra http stuff at the front of links!)