I suspect bipolarity is a feature, not a bug. It probably helped humans survive hard winters north of the equator by keeping us "depressed" and indoors during t

I suspect bipolarity is a feature, not a bug. It probably helped humans survive hard winters north of the equator by keeping us "depressed" and indoors during the harsh winter months and hyperactive during the more temperate months to harvest resources. Same with SADS and post-partum depression: keeps you indoors to care for a baby and avoid contracting new diseases or falling pregnant shortly after.