Rhubarb: delicious with strawberry pie, but steer clear of the leaves. Rae Ellen Bichell/NPR hide caption

itoggle caption Rae Ellen Bichell/NPR

Keep the soy sauce on your food, and use it in moderation. Aaron Tam/AFP/Getty Images hide caption

itoggle caption Aaron Tam/AFP/Getty Images

The bean of the castor-oil plant, Ricinus communis, is used in the production of castor vegetable oil and ricin, a poison. Sasha Vasko/via Flickr hide caption

itoggle caption Sasha Vasko/via Flickr