I like reading the newspapers and came upon this, crumb rubber, from one in New Mexico.
I have never seen the term before. It has a sort of tastiness to it, but I doubt anyone should be eating the stuff.
I am wondering if it is the strange pellets that are kicked up on artificial play fields. It is curious material. I think my niece tried eating some of it once. Her mother caught on and stopped her before any became lunch. Or maybe it was my littlest nephew.