 Translations of "dead" languages tend to rely on "bilingual" texts where the same message is written in both the dead language and a known language, allowing deduction of the meaning of symbols in the dead language by finding the corresponding symbols in the known language.The Rosetta Stone, for instance, contains texts in ancient hieroglyphs, a later developed Egyptian script, and ancient Greek.As the story points out, even pictures with captions are not necessarily helpful, giving the example of a picture of a man using a hand saw.