tengu1sd writes "The Los Angeles Times discusses the problems with trying to leave a message for generations down the line. From the article: 'Symbols tend to lose their meaning over time. Exactly how and why Stonehenge was built, for instance, has long remained a mystery. Warnings, they argue, would be misunderstood or dismissed, the same way ancient grave robbers ignored curses inscribed on the tombs of Egyptian pharaohs to seize the riches inside. The curse of plutonium packs a painful penalty.'"