"'Mixtape' is a very appropriate word to include in the title of Goran Hugo Olsson's film because it includes a rich mixture of cultural voices. They speak across different dividing lines such as those of haves and have-nots, youth and maturity, black and white, national and global, and the past and the present."

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Speciation does not necessarily promote evolutionary change; rather, speciation 'gathers in' and guards evolutionary change by locking and stabilization for sufficient geological time within a Darwinian individual of the appropriate scale. If a change in a local population does not gain such protection, it becomes-to borrow Dawkins's metaphor at a macroevolutionary scale-a transient duststorm in the desert of time, a passing cloud without borders, integrity, or even the capacity to act as a unit of selection, in the panorama of life's phylogeny.

— Stephen Jay Gould