Sidenote: Stealing ideas from contemporaries is rude and tasteless. Stealing from the long dead is considered literary and admirable. The same is true of grave-robbing. Loot your local cemetery and find yourself mired in social awkwardness. But unearth the tomb of an ancient king and you can feel free to pop off his toe rings. You’ll probably end up on a book tour, or bagging an honorary degree or two.