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

More Questions:

What is Barbie's last name?

Which English club was formed as Ardwick FC?

In which country was Rudyard Kipling born?

What did Temujin change his name to?

US city Milwaukee is located on the shores of what lake?

What color is the bottom strip of Egypt's flag?

In which country is the source of the river Danube?

What is the international radio code word for the letter F?

Who developed vulcanized rubber?

What is the more common name for Tympanum?

What is the curved line between any two points on a circle?

What 1996 movie features Michael Jordan returning to basketball after being influenced by a group of cartoon characters?

What was the first female rap group to win a Grammy in 1995?

Which one of opera’s "Three Tenor’s" names translates in English as "Quiet Sunday"?

The first cable car in the world began service in 1873 in what city?