It sits under glass, lit like a sacred relic. But it is neither jewel nor idol.The Rosetta Stone is a legal decree from 196 BCE, written in three scripts: Hieroglyphic, Demotic, and Ancient Greek. Its message? A rather mundane tribute to King Ptolemy V. Its impact? Revolutionary. Because when French scholar Jean-François Champollion deciphered it in 1822, he opened the door to reading ancient Egyptian hieroglyphs, and thereby reawakening an entire cultural heritage lost to ti