ALEXANDRIA, Va. — A Vienna man has pleaded guilty to possession of unregistered ricin on Wednesday. Ricin is a toxin that's naturally found in castor beans, according to the Centers for Disease ...

Ricin is a natural, highly toxic compound that is a byproduct of processing castor beans. If inhaled, injected or ingested, less than a pinpoint of ricin can kill a person within 36 to 48 hours due to ...

Forbes contributors publish independent expert analyses and insights. I write about biodiversity and the hidden quirks of the natural world. Some poisons are known for creeping slowly through the ...

I was looking at the delightfully spiky fruit of a castor bean plant recently, and speaking to the horticulturist who grows them where I work at Washington State University. Castor bean plants are an ...