HAIR

[Diana]

The above post is very interesting. With hair being an extension of the nervous system, it would explain why one's hair can turn gray overnight from a severe shock. Certainly just from a purely physical standpoint, one can imagine that long hair would respond to variations in air pressure, giving subtle clues to the environment (such as others moving about). It also seems interesting that the "hippie" generation, having rebelled against all control, would have embraced long hair to the extreme.