1. Who is credited with inventing the telephone?

2. Which material did Edison eventually use to create a filament that lasted over 1,200 hours?

3. What existing device did Gutenberg adapt to create his printing press mechanism?

4. What was James Watt's primary invention that made the steam engine efficient?

5. What did Ada Lovelace's first computer program calculate?

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

7. What prompted Edwin Land to invent the instant camera?

8. What did Marconi do to his antenna to significantly increase the range of his radio signals?

9. What was the main advantage of Armstrong's FM radio over the existing AM radio?

10. Which two metals were used by Alessandro Volta in his first battery?

11. Why did Christopher Sholes arrange the keys in the QWERTY layout?

12. What liquid did Torricelli use in his first barometer to measure air pressure?

13. How did users generate power for Alfred Traeger's Outback radio?

14. What is the primary purpose of the small tail rotor on a Sikorsky helicopter?

15. What did Faraday's 1821 experiment prove could be converted into mechanical motion?

16. How did the 'coherer' device detect radio waves in Marconi's early experiments?

17. What specific feature did Margaret Knight's machine add to paper bags?

18. What did John Harrison's marine chronometer allow sailors to calculate for the first time?

19. What was the main limitation of Galileo's thermoscope compared to a modern thermometer?

20. How did Fulton's steamboat overcome the challenge of traveling against river currents?