What plant is the most common cause of hay fever?

More Questions:

The gods Loki, Hel and Frey are from which mythological tradition?

What four US states begin with the letter "W"?

In what organ of the human body would you find the endometrium?

A "Tiercel" is the traditional term for a male what?

Who won an Oscar for her role in the movie "Annie Hall"?

What actor played the role of Ruby Rhod in the 1997 movie "The Fifth Element"?

What year was Mother Teresa born?

Which leader’s statue was pulled down from it’s place in red Square in 1991?

During the 20th Century, in what year did the annexation of Austria by German took place?

In what war did the oak-sided USS Constitution gain its nickname "Old Ironsides"?

Who used hypnotism to treat the hemophilia of Tsarevich Alexei?

The modern day sandwich was created during which century?

On January 1, 2016, which Canadian province became the first one to allow the testing of self-driving vehicles on public roads?

What comes in varieties freestone and clingstone?

The "Atomium" landmark is located in which country?