Reasons I love the internet.

I was looking at a wall earlier, there was some yellow lichen on it. I wondered what compound made it yellow.

Just now I typed "yellow flat lichen" into google. It took me to the wikipedia page for the common lichen

en.wikipedia.org/wiki/Xanthori

And that lead directly to the compound that makes it yellow.
en.wikipedia.org/wiki/Parietin

Just the sort of info I was looking for!

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