The archaeological discovery in Egypt that revealed much about ancient hieroglyphics is the Rosetta Stone. Discovered in 1799 during Napoleon's campaign in Egypt, this granodiorite slab features a decree inscribed in three scripts: Greek, Demotic, and hieroglyphic. The Rosetta Stone was pivotal in deciphering Egyptian hieroglyphics, as scholars could compare the known Greek text with the ancient scripts. This breakthrough allowed for the understanding of a vast body of Egyptian texts and culture, unlocking secrets of ancient civilization that had been inaccessible for centuries. The Rosetta Stone remains a key artifact in the study of Egyptology.