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…because literally nobody really knows what causes the depression.

We do actually have a lot of research into factors that can cause depression, which the article mentions:

"Different genetic variations can affect whether individuals respond to certain types of stress, such as sleep deprivation, physical or emotional abuse, and lack of social contact, by becoming depressed."

Yes, I agree that we know many correlating factors. We don’t now, however, how depression works on a biochemical level, and whether it is a process that could be described on such a level.

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