Figure 2.

Seasonal patterns in humans. (a) Number of suicides in Japan was significantly greater in the spring compared with autumn seasons. (b) The number of minor assaults in England and Wales significantly increased during the summer compared with winter seasons. (c) Number of battles in the Northern hemisphere peaked in August and were at a minimum in January; (d) the inverse pattern occurs in the Southern Hemisphere with peaks of battles occurring December–February; troughs in July. Data from (a,b) were kindly provided by Daniel Rock; (c,d) adapted from [59]. (Online version in colour.)