7 surprisingly early inventions

Another submission today from my dad :)

1. Adding machine - AD1642 : Blaise Pascal (France)
2. Concrete - 1st century AD : (Rome)
3. Encyclopedia - c.47 BC : Marcus Terentius Varro (Rome)
4. Lock - c.4000BC : (Mesopotamia)
5. Gun - 245 BC : Ctesibus (Greece)
6. Parachute - c. 2nd century. BC : (China)
7. Saw - c.4000 BC : (Egypt)