Adventures outside today... see the captions for details!
Mystery Guest... Alex's Granddad! Or as we like to call him... Dr. Vujan. And of course the lovely Emilia joined us, too!
“One of the ways we learn about the world around us is through our sense of hearing,” said Alex’s granddad. He brought out a tuning fork: a metal tool which vibrates when struck with a mallet, and emits a soft sound. Everyone got a chance to try hitting it and listening. Alex put the tuning fork on top of his head to feel the vibrations. His granddad commented, “You can even hear through the bones of your head.” Then he explained how sounds waves actually push the molecules in the air; he said, “The molecules of air are shaking back and forth.” Cassius asked, “What are molecules?” Alex’s granddad elaborated by saying, “In the air… It looks like there’s nothing there, right? But guess what? There’s gases. Oxygen, Nitrogen, water vapor… They’re invisible to our eyes.”
Thanks so much for coming in Dr. Vujan!