What novelist of westerns went by his middle name, since his first was Pearl?

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What are the names of the three children of Princess Grace of Monaco?

What company produced the first computer to run a Microsoft operating system?

What is the "Pale Blue Dot" in the title of Carl Sagan's 1994 book?

What river forms much of the border between Washington and Oregon?

Washington D.C. is located on the shores of what river?

In what US state would you find Fort McHenry?

How many US states border Mexico?

How many stars does Aries consist of?

What is the name given to the largest number ever used in a mathematical proof?

What jazzman's first recording band was the Hot Five?

What popular Walt Disney character shares a name with a planet?

Which famous duo released the hit song "Ebony & Ivory"?

What cartoon character was in love with his boss" daughter, Nell Fenwick?

Construction of the Colosseum finished under the ruling of which emperor?

Where is the only royal palace in the United States?