LifeMale masturbation in primates evolved to cut chance of catching STIs Masturbation in male primates seems to have evolved to boost reproductive success and cut the chance of getting a sexually transmitted infection, but the picture isn’t so clear for females ¿ìè¶ÌÊÓÆµ
HealthCalorie boost may explain why adults evolved ability to digest milk Why some people evolved the ability to digest milk in adulthood hasn't been clear, but the extra calories that young children got may have been key ¿ìè¶ÌÊÓÆµ