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			物理	生物	化學

很多搜尋器都提供分類目錄搜尋，例如：

• 科學 , 中文雅虎
  http://chinese.yahoo.com/Science/
• Cornell Theory Center Math and Science Gateway
  http://www.tc.cornell.edu/Edu/MathSciGateway/
• Physics, from Galaxy
  http://www.galaxy.com/galaxy/Science.html
• Go Education
  http://www.go.com/WebDir/Education/Fields_of_study/Science
• Yahoo
  http://dir.yahoo.com/Science/
• Science, The Gateway to information
  http://www.lib.ohio-state.edu/gateway/bib/science.html
• Science and nature, Excite
  http://www.excite.com/education/science_and_nature/
• Science and nature, WebCrawler
  http://www.webcrawler.com/education/science_and_nature/