What everyday item did John Walker invent?

More Questions:

Canonized in 1933, what famous nun is the patron saint of the French pilgrimage town of Lourdes?

A cat-o'-nine tails is a type of what?

What is the Los Angeles Memorial Coliseum also known as?

Vaccinophobia is the fear of what?

What was the original brand of cereal whose mascot was Crazy Craving?

Who is the Babylonian goddess of love and fertility?

What musical did "Cats" surpass as the longest running in Broadway History?

What is the capital of the Canadian province of Alberta?

What is the principal river of Ireland?

Mariner 9 was the first spacecraft to orbit what other planet?

What year did Alfred Hitchcock die?

What European city do Ethan Hawke and Julie Delpy wander in the movie "Before Sunrise"?

What 2016 nominated short film shares a name with an animated film also released the same year?

General Sherman’s “March to the Sea” ended in what city?

What European city was the first to have over one million residents?