Its still used in kids books and occasionally for perfumes, but what else is it good for?

Well, every year, after spending a thousand or so to fill up on fuel for the winter, we get a little safety newsletter from Ferrellgas and in the safety section it includes a little scratch and sniff sticker. And it smells just like propane (and is a lot safer than standing around breathing in around the top of an unlit BBQ). So today I had a short conversation with my four year old:

"Hey Max," I said
"Yes?"
"Check this out, its from the propane company, its a picture of how our propane system works and how to check if there's a problem."
"Really?" asked Max.
"Yes, it would be a problem if the gas was leaking out of the pipes."
"What could happen?" asked Max.
"Well if we didn't find it, and a bunch of gas leaked out, it could explode."
"Wow," said Max.
"Yes," I said, "so if you smell it we need to fix it right away. Look, I just scratch this circle right here and you can smell what it smells like."
Sniff
"That's weird," says Max.
"Yes. So if you smell that you come tell me."
"Ok," says Max.