41.
What device for new parents did Ann Moore invent in 1969?

42.
In which decade was the transistor invented?

43.
What invention was first installed at a Hartford, Connecticut bank in 1889?

44.
Ralph Samuelson was only 18 when he invented this sporting item in 1922. What was that?

45.
Who invented Bifocal Lens?

46.
What Karl Benz invented?

47.
When were bar code scanners invented?

48.
When was the game Frisbee invented?

49.
What piece of clothing was invented by French fashion designer Louis Reard in 1946?

50.
In which year was MIDI introduced?