Summary:

• **Scientists Discovered Why Rye Pollen Causes Cancer**: For 30 years, scientists were puzzled about why rye pollen contained a substance that could cause cancer in people. Recently, researchers finally figured out that rye plants make this dangerous chemical as a natural defense against insects and fungi that try to harm them.

• **Understanding Nature's Protection System**: Just like how our bodies fight off germs, plants have their own ways of protecting themselves from bugs and diseases. Scientists now understand that rye uses this special chemical weapon, but when humans are exposed to it through pollen, it can sometimes lead to cancer.