Less is more...

particularly re penis spines.
New study from David Kingsley's group on the loss of cis-regulatory elements on the human lineage.
Most notable:
"One deletion removes a sensory vibrissae and penile spine enhancer from the human androgen receptor (AR) gene, a molecular change correlated with anatomical loss of androgen-dependent sensory vibrissae and penile spines in the human lineage"

The Human Edge

interesting NPR series on 'what makes us human", includes tidbits on running, pigmentation, cooking, throwing...

Human uniqueness and, ehem, "tool use"

Just what makes us such an exceptional ape?

According to Jesse Bering at Scientific America:

"One reason why humans are special and unique: We masturbate. A lot"

(thanks for the tip, Karthik)