Approximately 10 percent of the world's population is left-handed. Notably, although most people use their right hands for performing tasks such as writing, approximately 30 percent of the population is mixed handed, whi... More »

The percentage of the world's population who have multiple-colored eyes is not documented. Most babies are born with blue eyes that vary in color but develop into a permanent shade by the age of 5. More »

According to a 2012 study by Runners World, Everyday Health, approximately half of one percent of the US population have run a marathon before. This equates to about one out of every 200 people. More »

According to the Huffington Post, about 10 percent of the world's population is left-handed. Handedness seems to be influenced by a combination of heredity and environment. Left-handedness appears to run in families, and... More »

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The percentage of the world's population who have multiple-colored eyes is not documented. Most babies are born with blue eyes that vary in color but develop into a permanent shade by the age of 5. More »

According to the Religion and Public Life Project at the Pew Research Center, there are 2.18 billion Christians worldwide, which is about 31.6 percent of the world population of 6.9 billion, as of 2010. About 50.1 percen... More »

There are 983 million people in the world who speak English, or 13% of the world's population, according to Ethnologue. It is estimated 372 million speak English as their first language, while 611 million speak English a... More »