California’s

In images: California’s neon blue tide

In images: California’s neon blue tide

A dazzling neon blue tide in San Diego, California, has got people out on the beach snapping the waves. The electric aqua colours are caused by a tide of blooming algae – by day the plankton turn the water red, but come nightfall they radiate a blue glow when the algae are disturbed by movement,…

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