Curly hair may have offered evolutionary advantages
Studies suggest curly hair could have aided heat regulation and brain protection in early humans by trapping air and shielding the scalp from UV radiation more effectively than straight hair.
Peak sexual encounters tend to cluster around night
A classic human behavior study found that, across adults, most sexual encounters occur around bedtime (roughly 11 PM–1 AM) — with a smaller peak after waking up.
Nipples don’t have muscle inside them — the erection of the nipple happens because of tiny smooth muscle fibers in the areola that contract in response to cold, touch, or sexual arousal.
