After $40 Billion, America’s Biggest Nuclear Dump Is Still Leaking

Begun in 1989, America’s biggest radioactive contamination waste site—run by the Department of Energy—has cost taxpayers roughly $40 billion so far and may take another 40 years and an additional $100 billion before the cleanup is done, according to the Environmental Protection Agency. And critics argue workers are getting sick while waste is still leaking.

Tusks for Terrorists: Ivory, Elephant Poaching and the War on Terror

African terrorist groups are funding themselves through the sale of ivory from illegally slaughtered elephants. That connection is giving the fight against poaching a martial makeover, styled after the wars on drugs and terrorism.

A Cautionary Tale: Tar Sands Oil and Health. Part 2

Plans to build the Keystone XL pipeline—designed to pump 35 million gallons of tar sands oil a day through the heart of America—are on hold, stalled by legal challenges about its route to Gulf Coast refineries from Canada. Yet there are very few answers to questions about the health risks involved in moving that kind of oil, as pipeline accidents in Michigan and Arkansas are demonstrating. WhoWhatWhy takes a look at those questions in the second part of a series.

Tigers Forever: Saving the World’s Most Endangered Big Cats

Wild tigers have disappeared from 90 percent of their historic range, and their population stands at a tiny fraction of a century ago. WhoWhatWhy science contributor Sharon Guynup collaborated with National Geographic photographer Steve Winter to raise an alarm about the state of this imperiled species in Tigers Forever: Saving the World’s Most Endangered Big Cats (National Geographic Books).