I've heard there's a penguin-related knowledge deficiency in this forum:
Math of the Penguins
"Though dominant winds can appear to push a huddle along the ice, the truth is more nuanced. Blanchette and his team’s model
made clear that the birds do not move in unison. Penguins in the huddle’s center, where temperatures reach a sweltering 100 degrees Fahrenheit, mostly stand still. A bird who finds himself on the huddle’s windward side is soon driven to relocate to its warmer, leeward side. As more birds leave the windward side, penguins in the center soon find themselves exposed. In due course, these penguins also depart for the leeward side.
Huddles typically last a few hours, during which the penguins may cycle through multiple rotations from the huddle’s cold exterior to its warm interior. In the process, each individual prioritizes his own warmth, yet the huddle’s heat is shared by all.
Penguins seem to know what mathematicians learned long ago: The densest packing of shapes on a plane is a hexagonal grid."