The Dept of Interior claims that the algae in the reflecting pool is left over from rarely used pipes
No.
Painting the pool dark blue means that it absorbs heat much faster than if it were a light color.
Warmer = faster algae growth
That's why you don't see black swimming pools
Science!
Pool for Fools
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Cartoon by Clay Jones Follow @claytoonz.bsky.social also on X @claytoonz