Whenever I indulge in guacamole made from a Hass avocado, I am reminded of its unlikely origin. In 1926, Rudolph Hass, a mail carrier in Pasadena, planted three avocado seeds in his avocado grove in ...

The genus Iris of flowering plants -- named after the Greek rainbow goddess because of the variation in flower color -- comprises over 300 species across the northern hemisphere, some of which are ...