61.
What African-American inventor received 5 patents in the field of shoemaking?

62.
It travels over land and water. Who invented the hovercraft?

63.
In which decade was the AEEE (now the IEEE) founded?

64.
What type of system did Paul Nipkow, John Baird, and Charles Jenkins all invent?

66.
Who invented Bicycle?

67.
Who synthesized the first wholly artificial gene?

68.
Who discovered the first practical method of freezing food?

69.
When was the Raggedy Ann doll patented?

70.
What Frank Whittle invented?