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Puerto Rico’s Glowing Lagoon Goes Dark
A glowing lagoon off Puerto Rico's northeast coast has gone nearly dark and biologists on Tuesday were trying to find out why.
Theories range from an increase in construction runoff to inclement weather to people clearing mangroves to allow larger boats into the area.
The bioluminescent lagoon, often referred to as a bay, attracts tourists who set out in kayaks or boats by night from the neighboring city of Fajardo to see waters that glow when microscopic organisms are disturbed. A greenish light swirls off hands and arms as visitors trail them through the water.

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