“I love the videos and that I can pause and play as I go. It is nice to add explanation or to give my kids the chance to finish pictures they are drawing.”

“Kids loved playing with the oscilloscope. The rope activity really made them understand the different wavelengths for high and low pitches.”

“We enjoyed the explanation of vibrations, especially seeing the oscilloscope in action. The explanations using musical instruments were very practical and useful. Thank you!”

“The kids totally understood the difference between pitch and volume! It reinforced our Science chapter for the week on energy, including sound energy!”

“The class loved the video and the information about the Mosquito device and whether or not they could hear the high-pitched sound. The activity worked well also.”

“Kids were fascinated to see the images of the sound waves coming off the object like ripples in a pond. Next day it rained and as they saw they drips they all correlated to drip ripples to the sound waves.”

“This one blew our minds. Worth the subscription just to teach this unit. Watching sound waves travel through air!?!?! What?!?!”

“All three sound wave lessons were a hit (I think I messed up and didn't respond when you asked about the first two. We did all three and the students were SOOOO engaged. I just finished conferences and so many parents said they were coming home both weeks telling them all about sound and the experiments. The students brought supplies to try to improve their cup phones in class and I guess they continued trying to refine them at home. In lesson three we used the online oscilloscope and that was another hit! The effort needed to make the ropes look like high and low soundwaves really brought home the difference of fast and slow vibrations!”

“The best part was when students connected what they learned in mysteries 1 and 2 to the concepts presented in mystery 3. Thank you!”

“My students enjoyed the really high pitched sound that I couldn't hear. : ) The visual comparison of the sound waves was very effective. I teach 1st grade so I didn't use the end of the video but the first half was wonderful and appropriate for their level.”

“So many parts of this lesson were really engaging for the students! We really enjoyed the on-line oscilloscope!! The "Bouncing Balls and Emojis" were fun! We found out that it's really hard to be completely silent! Even our kitchen refrigerator couldn't keep quiet!”