Raw cashews contain a toxin called urushiol. However, manufacturers typically roast cashews once or twice to make them safe to eat. Cashews are a popular tree nut consumed around the world.

Cashews may be a favorite snack, but their origin story is anything but ordinary. From toxic shells to upside-down growth, these quirky nuts have one of the weirdest journeys from tree to table.

When they're freshly picked, the shell that holds the cashew has a toxic oil that can cause blisters on your skin, like poison ivy. The shells are treated with heat, then removed to get to the nut ...

Getty Images/iStockphoto Cashew nuts are cased in a shell which contains a toxic oil that is harmful to humans. As a result, the healthy snack is roasted at high heat, either by steaming them in a ...

The new surfactant from cashew nut shell waste offers an eco-friendly alternative ... yielding unwanted toxic products. To address this problem, chemists use toxic organic solvents, and more ...