Coral Reef Facts for Sleep | Built by Animals Smaller Than Your Fingernail

The Great Barrier Reef is visible from space. It was built by animals smaller than your fingernail. That gap between those two facts is the whole story, and this is where we go tonight.

🌊 In this episode:

• How coral polyps extract calcium from seawater and build limestone, one microscopic layer at a time

• The symbiotic algae that live inside coral tissue and supply up to 90% of the reef's energy

• Why reefs can only exist inside a narrow band of temperature, depth, and water clarity

• The anatomy of a reef across time, from fringing reef to barrier reef to atoll, and what Darwin figured out from a boat in 1842

• The cleaning stations, ancient partnerships, and quiet agreements that hold a reef community together

• Two entirely different communities sharing the same coral on opposite schedules: the day shift and the night shift

• What a coral reef suggests about belonging, community, and complexity without a center

• A Day in the Life drift through the reef at the edge of evening, in warm amber water, as the night shift begins

Over two hours of unhurried reef, from the smallest polyp to the largest living structure on Earth.

Perfect for falling asleep, unwinding, or anyone curious about ocean life.

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