For decades scientists believed that monkeys could not speak human language due to an anatomical difference in vocal tracts. Today, we're not so sure that this is the limiting factor after all.

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Sources:
http://advances.sciencemag.org/content/2/12/e1600723.full
http://www.sciencemag.org/news/2016/12/why-monkeys-can-t-talk-and-what-they-would-sound-if-they-could
http://www.nature.com/articles/ncomms13803
https://www.eurekalert.org/pub_releases/2016-12/mu-seb120616.php

Image Sources:
https://commons.wikimedia.org/wiki/File:Bonnet_macaque_(Macaca_radiata)_Photograph_By_Shantanu_Kuveskar.jpg
https://commons.wikimedia.org/wiki/File:Prokaryote_cell.svg
https://commons.wikimedia.org/wiki/File:Erythromycin_A.svg
https://commons.wikimedia.org/wiki/File:GyraseCiproTop.png
https://commons.wikimedia.org/wiki/File:Lechuguilla_Chandelier_Ballroom.jpg