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Satellite image of blue-green algae. To the west is Sweden, to the east is Denmark and to the northeast is Finland
In Scandinavia in summertime there are huge fields of blue-green algae. They are considered an annoyance as people can't bathe, they smell, they affect marine life and are considered generally esthetically unpleasing. The fact that's fascinating to me about them is that these algae is ancient - They are one of the most ancient lifeforms there is. The blue-green algae/cyanobacteria existed a billion years before the Cambrian explosion. When there was nothing, no trees, no animals... nothing... there was this very same soup of blue-green algae - for a billion years.
How's that for perspective.