If all the kids have their own egg weight's from when you first weighted your eggs you can weigh the eggs now once again to see how many ounces each egg has gained or lost so far. This is one way to tell if any dark eggs are progressing as well as the others. Ask them do they think the egg gained a few ounces or lost a few ounces. Then ask them why they think that. I bet you will get some wild answers.That’s a great idea. Yes, I took weights after I picked up the eggs.