How online sales of highly regulated, super-toxic rodenticides exploit gaps in the law and imperil wildlife.

Conservationists saw the 6-year-old brown bear as a symbol of hope. Villagers saw him as a menace. Then he turned up dead.

How a loving daughter and star student stole barium acetate from her high school chemistry lab, put it in her father’s refried beans, and almost got away with murder.

The mysterious death of a champion Irish setter.

A writer returns home to find a toxic disaster, giant government failure, and countless children exposed to lead.

“They played a game of chess with our lives and we lost.”

What do you do when you think a family member is a murderer? Step one: stop eating her food.

On Marie-Madeline Marguerite, a 1600s French serial killer.

The death of a Russian dissident and how radioactive poison became a tool of assassins.

How the case of a poisoned college student in China, cold for 18 years, has suddenly turned into “what may be the largest amateur online manhunt in history.”

Beyond the fact that he lacked a pulse, little is known about the man found on an Adelaide beach in 1948.