What is the hardest substance in the human body?

More Questions:

Which US city is home to the Second City Comedy Troupe?

What does a "caliber" measure?

What Shakespeare play features three witches chanting "double, double, toil & trouble, fire burn and cauldron bubble"?

What has no reflection, no shadow and cannot stand the smell of garlic?

Who spent months rehearsing for "My Fair Lady" then had most of her singing dubbed by Marni Nixon?

What is the oldest symphony orchestra in the US?

Phnom Penh is the capital of which Asian country?

What is the only nation that shares a land border with Denmark?

What disease takes its name from medieval Italian words for "bad air"?

What is xenophobia?

What fruit comes in Redchief and Earliglow variety?

Who played the warden in the movie "Natural Born Killers"?

Who played Mr. White in the movie "Reservoir Dogs"?

Who was the first US president born in the 20th century?

What year was the computer worm, "Father Christmas", released into the world?