To add to this: while we lost the ability to decipher Egyptian Hieroglyphs until the Rosetta stone, the Egyptian language itself (the words and their meanings)

To add to this: while we lost the ability to decipher Egyptian Hieroglyphs until the Rosetta stone, the Egyptian language itself (the words and their meanings) continued to be known/understood/spoken to this day, in the form of the Coptic language. The Coptic language is essentially Greek letters (plus 7 additional ones for sounds not covered by the Greek alphabet) used to write the Egyptian language. Coptic was supplanted by Egyptian Arabic as the primary spoken language of Egypt following the Muslim conquest of Egypt, although it remains in use today as the liturgical language of the Coptic Orthodox Church. Another fun fact: the Greek letters used to write the Coptic language were based on the Phoenician alphabet, which were based on Ancient Egyptian hieroglyphs. So in essence, the alphabet brought over by the foreign Greeks and then used to write the Egyptian language, was itself based on Ancient Egyptian hieroglyphs, bringing it full circle!