What spice is the most essential and valuable commodity in the "Dune" universe?

More Questions:

Who built the French country house he called the Château de Monte-Cristo?

To make beer, what is barley normally made into?

Whose crime was witnessed only by Cindy Lou Who?

In what Irish city did Frank McCourt set his memoir "Angela's Ashes"?

Which artist released an album titled "St. Valentine’s Day" in 1948?

Nicosia is the capital of which country?

What country is Phnom Penh the capital of?

What fruit comes in Damson and Mirabelle variety?

What chemical element has been added to table salt since 1924, to help prevent goiter?

Who was the first dog in space?

What Australian rock band release the album "Business as Usual" in 1981?

In the movie "Days of Thunder', what car is Cole told to hit in his first race?

What is the name of the Duke Boys" car?

When did Indira Gandhi's first term as Prime Minister of India begin?

What is the second element on the periodic table?