Boston Children's Museum
308 Congress Street, Boston, MA 02210
Spring is a time of rebirth and renewal—and eggs! Many animals lay and incubate eggs in the spring, and in some cultures spring is a time in which kids paint, hide and eat lots of eggs. This makes it a great time to not only take a close look at eggs, but also to experiment with some of the things we can do with them. This activity is part of the Incredible Egg series of activities, which are designed to be done during the Spring—start your students off with this and other “egg science” activities, then move on to egg art, and finally take the Egg Drop Challenge!
See the instructions for The Incredible Egg for preparations regarding all of the activities in this series. For this activity, gather the raw eggs and the hard-boiled egg that you have prepared. Make sure to try out all of the other “Incredible Egg” activities:
Egg Science Activities
Egg Art Activities
Ask your students how many of them eat eggs. Have they ever had a hard-boiled egg before? Can they tell if an egg is hard-boiled just by looking at it? Can anyone think of a way that they might be able to tell the difference between raw and hard-boiled eggs without cracking them open?
Figure our which is which without having to open the eggs up!
After a few minutes, ask your children to talk about their theories of how you can determine which eggs are which.
If no one comes up with this method, show them this: Take 1 egg and spin it on its side (not on its pointy end). Stop the egg by briefly (and gently!) touching it with your finger just long enough to stop the spin (it should just be a split second), then lift your finger up off of the egg. Some eggs will stop spinning after you lift your finger up, while others will continue to spin. Does anyone have any guesses as to which egg is which?
After they talk about their ideas, you can tell your students that the hard-boiled egg is the one that stopped spinning, and the raw eggs are the ones that continue to spin after you lift your finger up. To prove it to them, take the hard-boiled egg (the one that stopped spinning) and crack it against the table. Unpeel the egg and enjoy.