Is fire a liquid, a solid, or is it even matter at all? And what is the science of asking good questions? Lindsay and Marshall dig into the Tumble mailbag to answer listener questions with the help of Tumble's science advisors, and respond to reviews! Somehow, the whole "cats are evil" thing just refuses to die.

We want to hear from you! Send us YOUR science questions, and let us know what you think of this mailbag episode! Here's how to do it:

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You can also stream Science Songs vol. 1 here, or find the album on Bandcamp here.

Our merch store is tumblepodcast.dashery.com, where you can find the bird jacket t-shirt!