Harper’s Index

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Next Month’s Index

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Percentage by which a “cool” 13-year-old is more likely than other teens to have future substance-abuse problems

: 45

Number of people killed in a 2010 explosion at a West Virginia mine operated by Massey Energy

: 29

Amount a Swiss firm charges parents for names designed to maximize their child’s future success

: $28,800

Tons of invasive carp that the Australian government plans to eradicate by giving them herpes

: 1,137,000

Amount one Colorado county spent in January to arm school security with assault rifles

: $12,000

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