We use the idiom "a tough nut to crack" to talk about problems that are difficult to solve, or to talk about people who won't do what you want them to.
However, this video is about a nut that is really tough to crack.
We use the idiom "a tough nut to crack" to talk about problems that are difficult to solve, or to talk about people who won't do what you want them to.
However, this video is about a nut that is really tough to crack.