黑暗的历史

[视频作者] 正经的知识

[视频时长] 0:30

[视频类型] 科学科普

参考：https://www.cbc.ca/natureofthings/features/human-zoos-a-shocking-history-of-shame-and-exploitation https://timeline.com/human-zoo-worlds-fair-7ef0d0951035 https://www.theguardian.com/world/2018/apr/16/belgium-comes-to-terms-with-human-zoos-of-its-colon