====== Tickling ======

The sensation of tickling has been scientifically investigated for more than 100 years (and unscientifically for many centuries before that) There are many unknowns associated with tickling in general. e.g.

  *Why are some body areas more ticklish than others?
  *Why are some people more ticklish than others?
  *Is there an evolutionary advantage for ticklishness?
  *Does it exist as part of parental 'bonding' process?
  *How is the sensation physiologically generated?
  *How and why does tickling trigger laughter?
  *Why is 'self-tickling' problematic?

Further info. at [[https://en.wikipedia.org/wiki/Tickling#Purpose|Wikipedia]]

//Note: //Many mammals other than humans are known to be susceptible to tickling - and also some reptiles and fish.