What the bees know and what they do not know

Much as I admire L. Fejes Tóth, bees do not build hexagonal cells. They build tubular cells of circular cross-section, and follow closest hexagonal packing (with some clever rhomboid-stuff at the base).

So http://projecteuclid.org/DPubS/Repository/1.0/Disseminate?view=body&id=pdf_1&handle=euclid.bams/1183526078 there.