Razib Khan is always up to something creative and Sunday night was no exception. Check out the google trend for "depression" he spotted unintentionally while searching for the economic meaning of the word:

This graph shows a clear seasonal trend and brings to mind the study on birth season that came out earlier this year from the University of Notre Dame. So perhaps we have yet another factor to consider in the equation of why winter babies seem to fall behind their peers... Might a parent's emotional state at birth influence the child's health and achievement later in life?