Petal Petal Petals are modified leaves that surround the reproductive parts of flowers. They are often brightly colored or unusually shaped to attract pollinators. Together, all of the petals of a flower are called a corolla. Petals are usually accompanied by another set of special leaves called sepals, that collectively form the "calyx" and lie just beneath the corolla. The calyx and the corolla together make up the perianth. When the petals and sepals of a flower are difficult to distinguish, they are collectively called tepals. Examples of plants in which the term "tepal" is appropriate include genera such as "Aloe"
Surround sessions Surround sessions Advertising sequence in which a visitor receives ads from one advertiser throughout an entire site visit. Recently introduced by the online unit of the New York Times, the "surround session" is creating a major buzz in the online advertising community. The session model represents a potentially significant shift in the way advertisers view online media, as more emphasis is placed on the real interaction between advertisers and audiences. In a surround session, an advertiser has all or most of the ads on each page for a visitor's entire site visit. As the visitor moves from page to page,