Humans
Green Olympic pool: perfect storm of sun, heat and still water?
The green diving pool in Rio is likely down to algae, encouraged by sunlight, warmth, and perfectly calm water that have combined to reduce chlorine levels
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The green diving pool in Rio is likely down to algae, encouraged by sunlight, warmth, and perfectly calm water that have combined to reduce chlorine levels
An exhibition of contemporary art gets the chemical elements to speak for themselves – but it's hard to understand their message