The binturong has a smell that resembles popcorn.
Why it is true
The binturong, a mammal from Southeast Asia also called the bearcat, has a gland in its tail that releases a chemical compound called 2-acetyl-1-pyrroline, the same one that gives popcorn its characteristic smell.
Source: National Geographic
Would you rather be asked first?
This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.