The "lead" inside an ordinary pencil is actually made of what material?
In which US city was the first Ferris wheel built, for the 1893 World's Columbian Exposition?
How many time zones does the contiguous United States have?
What is the term for a word that means the same thing as another word?
What was the name of the B-29 bomber that dropped the first atomic bomb on Hiroshima in 1945?
History