What is the main constituent of an eggshell?

More Questions:

Which popular method of brewing coffee requires the beans to be ground to a powder?

In 1934, five years before his retirement, who became the first athlete to appear on a Wheaties box?

Who composed the "Brandenburg Concertos"?

Where does the Bossa Nova dance music originate?

Off the coast of what continent will you find the Strait of Magellan?

What country borders Guatemala to the north?

What was patented by Eli Whitney in 1749?

What is the Scoville unit a measure of?

What fluid is stored in the gallbladder?

Who was the male star of the 1997 film "Titanic"?

On what book series is the HBO TV series "True Blood" based?

Who plays the Internet personality known as the Angry Video Game Nerd?

Who directed the 1982 movie "The Thing"?

In 1911, what entrepreneur retired as president of Standard Oil?

How many years long was the "Hundred Years’ War"?