Here is a video that needs to be viewed by your/our mid school and high school kids. Not just viewed but tested to determine whether they paid attention. If they fail the after test, take away their cell phones. They will not fail on the second try.
This is not just about Avogadro's number but how we got there in the first place....or the last place. The speaker is a scruffy looking guy who belies his appearance. He explains the subject well.
Why does Avogadro matter? It is not so much the subject details as it is the importance of learning about how things work.
(I expect that DL and Hermes may have already explained this stuff to the kids in their lives.
That was fascinating. Can't wait till Hermes comments on this :)