• Centers for Disease Control and Prevention
  
  CDC Centers for Disease Control and Prevention - Your Online Source for Credible Health Information
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• NASA
  in Top 100 Classics > Science & Nature with 100 classics nasa nature science top by 47 users
• National Geographic
  
  National Geographic provides free maps, photos, videos and daily news stories, as well as articles and features about animals, the environment, cultures, history, world music, and travel.
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• Science Daily
  in Top 100 Classics > Science & Nature with 100 classics daily nature science top by 48 users
• Space.com
  
  Get the latest outer space and science news, NASA information, watch space flight videos at Space.com. View exclusive solar system Images, latest astronomy news and more.
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  in Top 100 Classics > Science & Nature with 100 classics nature science top by 39 users
• WebMD
  
  The leading source for trustworthy and timely health and medical news and information. Providing credible health information, supportive community, and educational services by blending award-winning expertise in content, community services, expert commentary, and medical review.
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