Meanwhile, in a tickle lab…

From Armpits to Feet, Our Ticklish Hot Spots Are Surprisingly Universal. The Finding Offers Clues About the Sensation's Evolutionary Origins smithsonianmag.com

Ticklishness maps almost identically from person to person: armpits, ribs, feet, neck. Researchers probing gargalesis, the firm repetitive kind of tickling that produces helpless laughter, are using that consistency to ask what the reflex was ever for.