You can't live forever, they say. But some things can. And one of those things is probably a "Perpetual bond". Bond Baba knows your next question. What the heck is a perpetual bond? The idea is this: You give someone money when you buy a bond. They pay you some interest. Then at some later point in time, they pay you back the principal. That's about it. Imagine a bond which doesn't have the second part. They never pay you back the principal. Just the interest. Forever. How can you get your principal back? Well . . .