Your kid walks through ancient Egyptian technology every morning without noticing. Seven that survived.
1. Paper (papyrus)
Egyptians were processing papyrus reeds into writing surfaces as early as 3000 BCE. The word paper comes from papyrus.
2. Ink
Carbon black + water + gum arabic. The base recipe hasn't changed much.
3. Door locks
Wooden pin tumbler locks — the ancestor of modern door locks — were in use in ancient Egypt 4,000 years ago.
4. Eye makeup (kohl)
Kohl protected eyes from sun glare and was thought to ward off infection. Still widely used across MENA.
5. The 365-day calendar
Ancient Egyptian astronomers aligned the civil calendar to 365 days around 2700 BCE. Julius Caesar's Roman reform was essentially adopting the Egyptian system.
6. The first recorded peace treaty
The 1259 BCE Egyptian-Hittite treaty between Ramses II and Hattusili III is the first known written peace treaty in human history.
7. Toothpaste
Ash, pumice, burnt eggshell, myrrh. Not fluoride, but effective. Recipes exist on 4,000-year-old papyri.