Honeycombs end up hexagonal just from a bit of physics

According to research published in the Journal of the Royal Society Interface, bees initially make circular cells and use their body heat to turn the wax into a viscous liquid. Then the surface tension at the 3-point junctions pulls the wax into a hexagonal shape. Apparently Charles Darwin had come up with this idea before but didn’t have enough evidence to prove it.
Via Nature

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