A free radical is an atom or molecule that has an odd number of what?

More Questions:

What Broadway musical was based on the comic strip Little Orphan Annie?

What novel centres on the romances of Ursula and Gudrun Brangwen?

Who wrote, TIdings of Comfort and Joy in 1997?

Tegucigalpa is the capital of which country?

Tirana is the capital of which Eastern European country?

Which sea lies east of mainland Greece?

Which element is second on the periodic table?

The "K" in vitamin K stands for the Danish spelling of what eleven-letter word?

What was the first movie to feature Al Pacino and Robert DeNiro on screen together?

What is Mr. Freeze's given name?

What singer first hit #1 in 1984 with "Caribbean Queen (No More Love on the Run)"?

In the 1985 film "Witness', Harrison Ford's character goes undercover in what type of community?

Who recorded the album "Nebraska" in 1982?

What actor played "Shoeless Joe" Jackson in the movie "Field of Dreams"?

"Green Arrow: Year One" is a limited series published by who?