What tool helped researches decipher Egyptian hieroglyphics?

The key tool that helped researchers decipher Egyptian hieroglyphics was the Rosetta Stone. Discovered in 1799, it features the same text inscribed in three scripts: Greek, Demotic, and hieroglyphics. The Greek inscription provided a crucial understanding of the language, allowing scholars like Jean-François Champollion to unlock the meanings of the hieroglyphs by comparing the texts. This breakthrough was pivotal in understanding ancient Egyptian civilization and its writing system.