Ben Freivogel

A wormhole is like a tunnel with a very narrow throat. If you send a sound signal into such a tunnel, part of the echo returns, while part gets stuck in the middle, and will leak out very slowly.

A black hole horizon is like a soap film stretched over an abyss. From a distance it looks perfectly smooth, but up close it trembles. This ripple arises from quantum fluctuations — the continuous birth and death of particles in the vacuum.