Harper’s Index

Last Month’s Index

Next Month’s Index

Adjust

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