What’s the name of the Science of growing plants in liquid nutrients instead of soil?

More Questions:

What was the original brand of cereal whose mascot was Cornelius?

Which band's song was the 1 billionth iTunes download?

Which of Dickens" novels is set during the Gordon Riots?

What author created Discworld?

On which US river is the Grand Coulee Dam?

What is the capital of Pitcairn Islands?

What is the largest bay in Rhode Island?

What garden flower's name literally means "nose twister"?

Which planet has a year that lasts 88 days?

What popular movie website took its name from a John Travolta line in the movie "Broken Arrow"?

What British TV series featured Dave Lister and Frankenstein?

In what country was Arnold Schwarzenegger born?

In what city is the Schloss Cecilienhof, site of a historic 1945 conference?

What year gave birth to the word "motel"?

Which Hollywood celebrity was born Dino Crocetti in 1917?