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RT @m_clem: Incredible visualization of migration by intellectuals and leaders over last 2600 years https://www.youtube.com/watch?v=4gIhRkCcD4U by @nature via …
(original)
RT @m_clem: Incredible visualization of migration by intellectuals and leaders over last 2600 years https://www.youtube.com/watch?v=4gIhRkCcD4U by @nature via …
(original)