TIL that on pre-colonial Easter Island there existed an undeciphered system of writing or proto-writing, called Rongorongo, which would be one of few independent inventions of writing.

It implies that most of the written languages we're aware of have been based on preexisting character sets, with very few root character sets. This is one of those few root sets.

I believe you're correct on both

Such an amazing series! I love that there are content creators who make documentaries that rival mainstream production companies in terms of quality and their content is practically free.