In this special summer mailbag episode, Marshall and Lindsay help answer three kid questions:

• How do stem cells decide what to become?

• How do chameleons change color? and...

• What is Morse code?

This special episode features answers from Jessica Whited, Michel Milinkovich, and Mick Sullivan, from The Past and the Curious! As well as a roundup of listener reviews, and more!

For more information about Tumble, go visit our website at sciencepodcastforkids.com. To send us a question and get it answered on our show, go to https://tumble.science/Question.

Also support us on Patreon! patreon.com/tumblepodcast