If depression has an evolutionary purpose, it's certainly not obvious. Depression makes people consider suicide and less interested in sex, which does not encourage the species' survival. But two evolutionary psychologists theorize that depression's purpose is enhanced mental skills.

Moronic. Unbelievably stupid.

Depression is not "sadness," you idiots! You can't conduct a scientific research project where you simulate its effects by making people watch a short movie that makes them sad! Depression does NOT give people "more time to think" about problems. Depressed people do NOT have "enhanced mental skills" while they're depressed.

Stupid, unbelievably stupid. Only people who aren't depressed could ever have come up with such drivel.