The speaker was Professor Tom Seeley and his subject was the bee colony as a honey factory. The youngest bees in the colony are nurses for their larval sisters until they’re about 10 days old. Then, until about 19 days old, they become food processors and storers. Then, when they have lost their youth, they become foragers, a role that continues until they die of old age are snapped up by swallows etc.
Foraging is hard work and the hours are long so the foragers sleep at night but are shaken awake by their little sisters in the morning. If the foragers are gathering more than the processors can cope with they try to recruit more with a tremble dance. They head butt the foragers to tell them not to get any more for the time being.
Someone asked how the bees make beeping noises. The answer was by vibrating the wing muscles, however the sound can’t be heard by the bees but felt through vibrations transmitted via the comb.