Adam told me he would NOT mess with his bees or open up their hives, until Friday. Ha.
Today he checked to see if they were capping brood -- in other words, if they were covering up the comb cells where the queen has laid her baby bees. The bees who tend to the babies are (you guessed it!) "nurse bees." They feed the larvae. If you look closely in these little holes, you'll see some white bee larvae, curled up in a "fetal" position. In other little holes, the bees have already capped the larvae; they put wax over the larvae cell after they've adequately fed the baby bee, and let it grow.