25 Bizarre Historical Facts You Didn’t Know

Aren't you glad dentures are no longer made from the teeth of dead soldiers? Here are 25 bizarre historical facts you didn't know.
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At its peak the Roman Empire stretched for 2.51 million square miles. It was only the 19th largest empire in history.
It has been calculated that in the last 3,000 years there have only been 240 years of peace in the world
The current US flag was designed by high schooler Robert Heft as part of a school project for which he recieved a B-. When his design was chosen to represent the nation his teacher changed the grade to an A.
Of the ten deadliest wars every fought, seven were fought in China
More people died in each of the two largest than in WWI
The US Constitution contains many spelling and grammatical errors
In spite of the larger-than-life legends, the Pony Express only lasted 19 months (April 1860 to October 1861)
At its height in 480BC the first Persian Empire covered 44% of the world's population.
This is the largest percentage of any empire in history. By comparison the British only had 20%
Mexican General Santa Anna had a huge state funeral in honor of his amputated leg
Up until the 1800s dentures were often made from the teeth of dead soldiers.
During the ice age, people in the British Isles used humans skulls as cups
In ancient Egypt the servants were covered in honey so as to attract flies away from pharaoh
During the An Lushan rebellion in China in the mid 700s nearly 40 million people died. This was 1/6 of the world's population.