Communicating with Extraterrestrials

Inscribed matter as an energy-efficient means of communication with an extraterrestrial civilization: turns out that for distances over ~100 light years, it's more energy-efficient to actually post the aliens a DVD than to send them a radio signal. If you're not in a hurry. I'm really, really glad that Nature publishes stuff like this from time to time; why let Proceedings of the Royal Society have all the fun?