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========== This episode is supported by Edx. Termites, prairie dogs, and people are all
great builders, each in their own way. And we all share one crucial problem. Put a bunch of us in a closed space, breathing
Oxygen in and CO2 out… and it doesn’t end well. Our tallest skyscrapers and deepest mines
are almost completely cut off from outside air. To keep those inside from suffocating, human
engineers use giant machines to bring in fresh air and pump stale air out. Termite mounds have the same problem. The largest are more than 10 meters high. On a human scale, that’s like a skyscraper
three and a half kilometers tall! Only instead of condos and offices, it holds
one big farm. The termites collect wood, which grows fungus,
that the termites eat. All ...