In the early 90s, a new study that found that kids who are exposed to more germs early in life are less likely to develop allergies later. With the West in the grip of a full-blown immunity crisis (still going on today), this was an interesting thought.
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Selects: Mangroves: Nature's Best Tree?
44:31

How the Kowloon Walled City Worked
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Short Stuff: In-Flight Entertainment
12:23