Try
www.refdesk.com - It's the first place I go every day because it contains not only links to all sorts of news sites, but also features interesting facts (down the middle of the page), unusual bios (about not-famous people), NASA photo of the day, quotation of the day, and various calculators.
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www.aldaily.com - it's basically a site with links to all sorts of literature sites, book reviews and interesting articles in science magazines