1. When was the first airplane flight?
    
2. How many classes of levers did Archimedes describe?
    
3. When was the BAND-AID® perfected?
    
4. Who invented BIFOCAL GLASSES?
    
5. Who invented Blue Jeans?
    
6. Who invented Chocolate Chips?
    
7. Who first envisioned (but not actually made) contact lenses and what year?
    
8. What were the first crayons marketed in 1903
    
9. Name 7 inventions created by Leonardo da Vinci
    
10. Who invented the slinky?
     
11. When was toilet paper invented?
     
12. Who invented the Popsicle?
     
13. Who invented Potato Chips?
     
14. When was Kool-Aid invented?
     
15. Where was the metric system created?
     
16. How did Dr. Percy LeBaron Spencer get the idea for a microwave?
     
17. When was silly putty taken to the moon?
     
18.  What gave George de Mestral the idea for Velcro?