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100

I speak without a mouth and hear without ears.  I have no body, but I come alive with the wind.  What am I?

An Echo

100

Which bridge was the first to be built across the River Thames in London?

London Bridge

100

What mammal has the most powerful bite?

Hippopotamus:  Approximately 1800psi

100

What creature has a tongue that can measure the length of its body?

Chameleon 

100

You measure my life in hours and I serve you by expiring.  I'm quick when I'm thin and slow when I'm fat.  The wind is my enemy.  What am I?

A Candle

200

What is a group of cats called?

A Clowder

200

What is the smallest mammal in the world?

Bumblebee bat

200

In which country did the Easter Rising take place in 1916?

Ireland

200

Ronald Amundsen led a successful expedition to what location in 1911?

South Pole

200

Who invented the cotton gin?

Eli Whitney 

300

How many days was William Harrison President?

32

300

How far away can a wolf smell its prey?

Almost two miles

300

What name is given to Britain's policy of avoiding strict enforcement of parliamentary laws on early American colonies?

Salutary neglect

300

How did Alexander the Great solve the puzzle of the Gordion Knot?

He cut it with a sword. 

300

What year did the war of 1812 end?

1815

400

Which has the thickest fur of any mammal?

Sea Otter

400

How many U.S. presidents have been assassinated?

Four

400

When did the first space shuttle go into space?

April 12th, 1981

400

How many teeth can a crocodile have over its lifetime?

Up to 4,000.

400

Which Russian astronaut was the first man to conduct a space walk?

Alexey Leonov

500

What was the family name of the Russian rulers from the 17th century until the 1917 revolution?

Romanov

500

When did Mao Zedong come to power?

1949

500

Who was shot outside the Hilton Hotel in Washington on March 30th, 1981?

President Ronald Reagan 

500

Which mountaineer and his Sherpa became the first men to conquer Mount Everest?

Sir Edmond Hillary and Tenzing Norgay

500

Which Greek historian is known as the "Father of History"?

Herodotus