What vitamin deficiency causes Rickets?

More Questions:

What was pictured on the face of the US penny just prior to Abraham Lincoln?

Who developed the processed cheese spread known as Cheez Whiz?

What American author created the characters of Rip Van Winkle and Ichabod Crane?

What nation's legislative body is named The Rajya Sabha?

What river flows through Colorado's Black Canyon?

What is added to copper to make bronze?

What defined as "the ratio between a circle's circumference and its diameter"?

What creature's bite can lead to Lyme disease?

Keyrock, the simple minded cave-man lawyer was played by what comedian on Saturday Night Live?

In the TV show "The Simpsons', Lenny and Homer were members of what secret society?

Who were the principal members of the band "The Beatles"?

On what TV show would you see Kirby Plaza, named for Fantastic Four creator Jack Kirby?

What screen legend made his final appearance in the movie "The Shootist"?

Samuel Miller patented the first steam-powered what in 1806?

What name is given to the area of the sky that is obscured by the Milky Way?