WEB ADVERTISING Since its debut in April 1996, Scientific American's Web site has been met with great enthusiasm, receiving more than 31,000 visits per week. The site combines the editorial excellence and authority Scientific American is known for with a true understanding of the interactivity of the medium. Many elements are unique to the Web version. Those originating in print are enhanced for the electronic experience. Advertising Rates (effective July 1, 1997)

Monthly impressions guarantee:	30,000
Price per month:	$3,000
Minimum commitment:	$3,000 (one month)

Positioning All banners receive run-of-site positioning in rotation on the highest-trafficked pages, including the home page. Banners are positioned at the top of the page for maximum visibility. Creative Specifications Ad banner creative may be changed weekly, or various banners may be rotated randomly. Materials must be received at least two business days prior to the scheduled appearance on the site. All banners are subject to approval by the Associate Publisher/Advertising Director. Banner size: 234 pixels wide by 60 pixels high File Format: GIF or JPEG with file saved in RGB color No Maximum File Size Providing Materials Instructions for picking up banners from a Web or ftp site can be e-mailed to Laura Salant (LaSalant@aol.com). Please include the URL of the site to be linked to. Alternatively, banner files can be e-mailed to LaSalant@aol.com or supplied on disk to: Laura Salant Marketing Director Scientific American 415 Madison Avenue New York, NY 10017 Phone: 212/754-0590 Fax: 212/754-1138 Impressions and click-through statistics (collected with NetGravity software) are available on request. Please provide the contact name, phone and fax numbers and e-mail address of the person who should receive statistics.