The best example of cultural diffusion would be when the Europeans interacted with the Americans. They both taught each other about their cultures.
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A combination of wealth and a time of relative peace often leads to cultural achievement.
The Spanish outnumbered the aztecs
Although they were immortal, they had many characteristics of humans.
There is no tenth muse in mythology. There are the nine best known muses, as well as a trio that pre-dates them, but none that are called tenth. The writer Plato called the poet Sappho of Lesbos "the tenth muse," and the term has since been applied to other female poets, as well as Queen Berenike of Egypt, and various other women.
Just as man's best friend is his dog, Hades' best friend was Cerberus.