1. What was the first capital of the United States?

2. What material is most commonly used as the substrate for integrated circuits?

3. What did Robert Hooke first discover and name while looking through a microscope in 1665?

4. What type of waves does a radar system use to detect objects?

5. What are the four 'strokes' in the internal combustion engine cycle named after Nikolaus Otto?

6. What material did Alfred Nobel mix with nitroglycerin to make it stable?

7. Who is credited with the first successful jump with a parachute in 1783?

8. How does a diesel engine ignite its fuel without using a spark plug?

9. What was the first commercial product made using nylon?

10. What material was the shell of the first computer mouse prototype made of?

11. What improvement made 'safety matches' safer than early friction matches?

12. What major era in American history did the invention of barbed wire effectively end?

13. What did Elisha Otis do at the 1854 World's Fair to prove his invention worked?

14. Which biological organ does a dialysis machine mimic?

15. Approximately how long does it take for a modern airbag to inflate during a crash?

16. What does the 'R' stand for in RDBMS, the system invented by Edgar F. Codd?

17. Which gas was used in the first successful public demonstration of surgical anesthesia in 1846?

18. Who is most famously credited with developing the first commercially successful steamboat in the United States?

19. What was a major danger of 19th-century steamboat travel?

20. What role did steamboats play in westward expansion?