One of the most anticipated events in the 4th grade is the embryology program in the classroom. We obtain a dozen or so fertilized eggs from Penn State Extension Agency. In our classroom incubator, we keep them warm for the last week of their 21 day incubation period.
During this week-long period, we turn them multiple times a day to keep the embryos from sticking to their shells. On Friday, we stop and leave them for the weekend.
As the chicks hatch, we play a lullaby over the loudspeaker to share the happy news with the whole school, just like the hospitals do.