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 »

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 »

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 »

The University of Texas estimates 32 out of 1,000 people are a twin, which translates to 3 percent of the population. As of 2009, approximately one in 30 births results in twins. More »

According to the U.S. Census Bureau, the estimated population of the world in 1900 was between 1.55 billion and 1.762 billion people. Since then the world population has grown to about 7.2 billion people. More » World View Social Sciences Population & Demography

Although there is no definitive way to accurately determine the number of people in the world with hazel eyes, experts estimate that around 5 to 8 percent of the world's population have this eye color. Hazel eyes are sim... More »