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• Estimated number of humans who have been born in the last 50,000 years (when modern humans appeared): 107 billion

• Percentage of humans ever born who are alive today: 6.5

• Percentage of U.S. adults who considered homosexual relations morally acceptable in 2002: 38

• Percentage who considered homosexual relations morally acceptable in 2012: 59

• Year the Mars One program plans to establish a permanent colony on the surface of Mars: 2023

• Number of settlers who will initially populate the Mars colony: 4

• Number who will return to Earth: 0

• Number of sexual assaults estimated to have occurred in the U.S. military in 2012: 26,000

• Number reported: 3,374

• Number of reports that resulted in military court prosecution: 594

• Distance in feet the robot “Vomiting Larry,” designed to study disease transmission, can hurl puke: 10

• Gigatons of carbon dioxide humanity added to the atmosphere between 2000 and 2011: 321

• Maximum additional gigatons we can release between now and 2050 and still have an 80 percent chance of limiting global temperature increase to 2 degrees Celsius: 565

• Gigatons we would release by burning the world’s remaining proven fossil fuel reserves: 2,795

• Percentage of discretionary spending devoted to defense in President Barack Obama’s proposed 2014 budget: 57

• Percentage devoted to education: 6

• Rank of the United States, out of 29 developed countries, in overall child well-being: 26

• Rank of Greece: 25

• Rank of Lithuania: 27

• Length in miles of the Appalachian Trail, which extends from Georgia to Maine: 2,180

• Percentage of hikers who complete the entire Appalachian Trail out of those who attempt it: 25

• Percentage of climbers who summit Mt. Everest out of those who attempt it: 29

• Number of Mt. Everests, from sea level to summit, equal to the total elevation climbed by hiking the entire Appalachian Trail: 16

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Chris Francis is a former editorial intern for ¾«¶«Ó°Òµ

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Katrina Rabeler is an environmental specialist at Ecology and Environment, Inc. and a former editorial assistant for ¾«¶«Ó°Òµ

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