Here is a superb documentary short by Quartz, in collaboration with Retro Report, explaining bitcoin in a fascinating and understandable way.
It starts off with a visit to a tiny Pacific island called Yap, where traditional coins weigh several tons!
"In some sense, bitcoin is a return to this earlier concept of communal record keeping."--Nathaniel Popper, author, “Digital Gold”
Beautiful cinematography, informative interviews, and high production values all around in this mini documentary.