The concept of passports - that people should enjoy protected freedom of movement - is an ancient one. It wasn't until WWI that they became universal. Learn all about this overlooked, important document.
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Selects: Birthmarks: Probably Not the Mark of the Devil
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The Stuff You Should Know Doin’ Science Playlist: How Chaos Theory Changed the Universe
55:00

The Stuff You Should Know Doin’ Science Playlist: How Global Warming Works
1:00:10