 Our radio telescopes that we use for SETI, the observing systems that we use at radio telescopes are not dissimilar from this radio. Now if I turned on this radio, all you would hear is static at most places on the radio dial. But at certain places on the radio dial, there's music, or there's talk radio, there's a signal there. And a signal from an extraterrestrial technology would look very much the same. It would have extra energy or some kind of a signal at only one channel, at only one channel on the radio dial. Luckily, we don't have to tune a dial with our instruments. Our instruments can actually monitor billions of different radio frequencies all at the same time instantaneously. So if we see any radio station, if we see a signal that pops up against the static, then we know that there's something interesting there.