The 1910 anatomical sketch of the stinger valves
Biologists first illustrated the honey bee stinger's internal valves, noting their unusual structure. The illustration showed the valves but not how they worked.
The valves' function remained unexplained for over a century.
The 2026 PNAS study finally revealed them as collapsible pistons.
Shows how a biological mechanism can remain mysterious despite being observed for over 100 years.
