An Inuk wearing snow goggles. Is ambient light at its lowest in Inuit territory? The logjam seems to have broken. On the heels of Lewis et al. (2011), we now have another paper on variation in brain size among human populations, this time by Pearce and Dunbar (2011). Brains vary in size by latitude, being... Read More

Does closeness to the equator make a woman likelier to have daughters? So says Kristen Navara (2009) in a recent article in Biology Letters: The article notes that this pattern results largely from low sex ratios at birth in sub-Saharan Africa. This is no surprise. Many other authors have noted relatively low numbers of male... Read More