Chocolate's addictive properties are due to what alkaloid?

More Questions:

What kind of a ring is a "dohyo"?

The cover of what band's 1977 album "Animals" depicts a large, inflatable pig flying over London's Battersea Power Station?

What type of athlete is also called a powder puff, tanker, catcher or knuckle duster?

What are you frightened of if you are Alektorophobic?

What number is represented in Morse code by 5 dots?

What three countries share a land border with Somalia?

Which sea lies west of mainland Greece?

The Egyptian plover is a bird best known for its symbiotic relationship with what host animal?

In The Simpsons episode, "Treehouse of Horror V," what does Homer turn into a time machine?

What's the protagonist's name in the 1931 movie "Little Caesar"?

Who was Olive Oyl's boyfriend before Popeye?

Which TV series was narrated by Walter Winchell?

What TV show starred Suzanne Somers as Carol Foster/Lambert?

What year did the "Turbot War" fishing dispute start?

What unit of measurement is approximately 100 fathoms?