Flowering plant serve to protect the sporophylls and to form an envelope attractive to pollinators. The individual members of these surrounding structures are known as sepals and petals (or tepals in flowers such as "Magnolia" where sepals and petals are not distinguishable from each other). The outer series (calyx of sepals) is usually green and leaf-like, and functions to protect the rest of the flower, especially the bud. The inner series (corolla of petals) is, in general, white or brightly colored, and is more delicate in structure. It functions to attract insect or bird pollinators. Attraction is effected by color, scent, and
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,