What everyday item did John Walker invent?

More Questions:

What are the only two ingredients allowed in the "host', the Catholic Communion wafer?

In the standard game of Scrabble, what is the value of the letter "Z"?

What two pieces are moved in chess's castling maneuver?

The Christmas carol "One Horse Open Sleigh" is better known under which title?

What is Bridget Jones" home city?

Who wasn't afraid to call James Joyce "a greasy undergraduate"?

Tchaikovsky is considered to have died of which disease?

In what US state is Dulles International Airport located?

What is the capital of the Australian state of Tasmania?

Who is generally regarded as the inventor of the internal combustion automobile?

What is January's birthstone?

What is the medical term for fainting?

Who invented the vacuum flask?

What was the capital of East Germany?

Who took 18 days to write the Declaration of Independence?