“Smoking Gun” Evidence That Mammals Were Not the First To Be Warm-Blooded

Animal Ears Explain the Evolution of Warm-Bloodedness

The Mystery of When Warm-Blooded Mammals Evolved May Finally Be Solved

A systematic umbrella review of the evidence finds "no consistent evidence of there being an association between serotonin and depression, and no support for the hypothesis that depression is caused by lowered serotonin activity or concentrations."