There are actually seven different types of twins: Identical, Fraternal, Mirror-Image, Polar Body (Half Identical), Mixed Chromosome, Superfecundation, and Superfetation.
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Muhammad is the most common name in the world.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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More than half the population of Kenya is under the age of 15.
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There are two credit cards for every person in the United States.
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Approximately 365 million people in the world have computers while half of the world's 6.5 billion population has never seen or used a telephone.
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It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
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