Get some empty egg shells, draw faces and fill the shells with compost or moist kitchen towel.
Sprinkle cress or mustard seeds on top and watch them grow into amazing hair. They taste nice as well!
Also, the NFU is doing some free live lessons next week – for example, lambing live! Click on the link to sign up in advance and then join in on Monday at 11am. https://encounteredu.com/live-lessons/science-farm-live