Thomas Edison designed a helicopter that would work with gunpowder. It ended up blowing up and also blew up his factory. See more

It took approximately 2.5 million blocks to build the Pyramid of Giza, which is one of the Great Pyramids. See more

In 10 minutes, a hurricane releases more energy than all of the world's nuclear weapons combined. See more

In 2006, there were 398 million mobile (or cell) phones in China. See more

There are 100 million internet users in China. Some of the sites they can't access are BBC news, Amnesty International and Dalailama.com. See more

Americans own roughly 42 percent of all the world’s privately held firearms while making up less than 5% of the world’s population. See more

The US holds 31% of global mass shooters while making up less than 5% of the world’s population. See more

Estimated in 2007, the number of civilian-owned firearms in the US was 88.8 guns per 100 people. See more

Yemen, a quasi-failed state torn by civil war, had 54.8 guns per 100 people in 2007. See more