One of the world's rarest flowers has been stolen, Britain's Kew Gardens announced this week. The water lily Nymphaea thermarum is seen here in 2010. Andrew McRobb/AP hide caption

itoggle caption Andrew McRobb/AP

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

itoggle caption Rae Ellen Bichell/NPR