How to Detect Rocks Without a Lick

This week on si show tangents, we learn how to identify rocks by licking them. We also find out that worms aren't as long and goy as they look. And a new way of eating wood is revealed in the form of a worm called philippines.

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Igneous, sedimentary, metamorphic... need I say more? Welcome to SciShow Tangents or, as I like to call it, Rock Talk.

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[Trivia Question]

Stonehenge sarsen vs. Dwayne “The Rock” Johnson

https://www.livescience.com/22427-stonehenge-facts.html

[Fact Off]

Microgranite used for curling stones

http://nora.nerc.ac.uk/id/eprint/505002/

https://earthobservatory.nasa.gov/images/91856/ailsa-craig

https://olympics.com/en/news/the-remarkable-properties-and-origins-of-the-olympic-curling-stone