At what wind speed does a tropical storm become a hurricane?

More Questions:

What color is the central square on a Scrabble board?

How many times can you fold a regular piece of paper in half?

What's the traditional dish served at Wimbledon?

To which group of artists does Vincent van Gogh belong?

What street gang rumbles with the Sharks in "West Side Story"?

What is the capital of the US state of Missouri?

On which river does the city of Dublin stand?

Which tribes are native to New Zealand?

The port of Piraeus is located in which European country?

What astronomical unit of distance equals about 5.88 trillion miles?

What term applies to space devoid of matter?

Which element appears eighth on the periodic table?

What vitamin was isolated from fish liver oil in 1917?

Directed by Sydney Pollack, which film won the Oscar for Best Picture in 1986?

In World War II, where was the defensive line known as the "Gin Drinkers Line"?