InformationAll PPLD facilities will be closed Monday, May 27, for Memorial Day.
PPLD.org, The Catalog, and wireless may also be unavailable as we run server updates.

Science

  1. Academic Earth -

    Full video courses and lectures from the world's leading scholars. Includes a large number of subjects, from Art & Architecture, Economics, History, Law, Literature, Psychology, Test Preparation, and much, much more!
  2. Animal Information, Endangered Species, Pet Information, Wildlife in Colorado -

    Links to the Animals section of Recommended Websites.
  3. Astronomical Data Services -

    Moon Phases, Sunrise, Sunset, Moonrise, Moonset, etc.
  4. Astronomy Interactive Network -
  5. BBC Nature -

    Watch video clips about hundreds of different animals, including mammals, prehistoric animals, birds, reptiles, amphibians, fish, cephalopods, insects, arachnids, and more.
  6. Biodiversity Heritage Library -

    A consortium of natural history and botanical libraries that have digitized their collections. Browse or search for titles, authors, subjects, maps, publication date, and collections.
  7. Biomes / Habitats -

    From Enchanted Learning.
  8. Chemical Elements.com -

    Chemical Elements.com talks about atomic structure, name, symbol, properties for elements.
  9. Ciencia.Science.gov -
  10. Climate Central -

    Provides research, news, videos, galleries and more regarding climate change.
  11. Colorado Geology -

    From the Colorado Geological Survey - includes timescale, events, earthquake information, hazards, etc.
  12. Cool Science -

    Interactive site to allow exploration of science. Also features an "Ask a Scientist" option.
  13. Denver Museum of Nature & Science -
  14. Dinosaur Central -

    From Discovery.com.
  15. Dinosaurs -

    From the National Museum of Natural History.
  16. Dinosaurs Guide -

    From How Stuff Works - learn about dinosaurs, including carnivores, herbivores, omnivores, and other prehistoric & extinct animals.
  17. Discovery.com -
  18. Earth Science Guide -

    From How Stuff Works - learn about the history of the earth, inside the earth, the earth's exterior, rocks & minerals, space & the solar system, and weather & atmosphere.
  19. Earth Trends -

    Comprehensive online database that focuses on the environmental, social, and economic trends that shape our world.
  20. Earthquake Hazards -

    Earthquake Hazards Program is website from U.S. Geological Survey.
  21. Earthquakes -

    From Answers.com.
  22. eNature.com -

    Information about wild animals and plants of the United States. Includes field guides on more than 5,500 species.
  23. Encyclopedia of Life -

    Combines resources about all living things into one portal.
  24. Environmental Chemistry.com -

    Elements: atomic structure, properties, HazMat info.
  25. Exposición en linea @ Exploratorium -

    Exploratorium exhibits and experiments in Spanish.
  26. Extreme Science -

    Includes records and more within the animal kingdom, earth, ocean, space, time, and weather.
  27. Facts Encyclopedia: Science and Technology -

    Links to a wide range of science and technology subjects, from how to use an abacus to windows to the universe. From Refdesk.com.
  28. Famous Inventions: A to Z -

    From About.com.
  29. Famous Inventors: A to Z -

    From About.com.
  30. Florissant Fossil Beds -
  31. Follow Your Curiosity -

    NASA's website for the Mars rover Curiosity. Daily updates, information about the rover and the mission to Mars. Also contains interactive media, images, videos, raw images, Mars for kids and educators and more.
  32. Fossils, Rocks & Time -

    From the USGS.
  33. FreeComputerBooks.com -

    Includes a huge collection of free computer, programming, mathematics, engineering, and technical books.
  34. FreeTechBooks.com -

    Online computer science, engineering, and programming books, textbooks, and lecture notes.
  35. GeneEd -

    Includes information on Cell Biology, DNA, Genes & Chromosomes, Heredity/Inheritance Patterns, Epigenetics/Inheritance and the Environment, Genetic Conditions, Evolution, Biostatistics, Biotechnology, DNA Forensics, and Top Issues in Genetics. From the National Library of Medicine (NLM), National Human Genome Institute (NHGRI), and National Institutes of Health (NIH).
  36. Global Warming Information -

    From the National Oceanic and Atmospheric Administration.
  37. Gray's Anatomy -
  38. Great Idea Finder -

    Find out about inventors and inventions.
  39. Great Images in NASA -

    Great Images in NASA showing photos of spacecraft, astronauts and space.
  40. Greatest Engineering Achievements of the 20th Century -

    Includes history and timelines.
  41. How Many? -

    A Dictionary of Units of Measurement.
  42. Human Genome Project Information -
  43. Hydraulic Fracturing -

    Overview of "fracking," including links to an interactive map, fact sheet, multimedia collection, and related links. From the USGS.
  44. HyperPhysics -

    HyperPhysics is an exploration environment for concepts in physics which employs concept maps and other linking strategies to facilitate smooth navigation.
  45. InnerBody - Human Anatomy -

    Includes diagrams, animations, tutorials and explanations.
  46. Interactive Units Converter -

    Weight, mass, distance, length, speed, temperature, etc.
  47. Invention Facts and Myths -

    Includes a timeline, inventor biography, trivia quiz, etc.
  48. Inventors -

    Famous inventors and inventions.
  49. Khan Academy -

    Over 3000 videos covering topics in math, science, history, civics, art, and test prep. Also offers over 315 practice exercises, teacher resources, and much more.
  50. Kids Do Ecology -

    Learn about ecology, marine mammals, world biomes, data and science (such as using the scientific method, how to read graphs and charts, etc.) and more.
  51. Landscope America -

    Explore places & topics such as conservation lands, plants & animals, ecosystems & habitats, natural geographies, and more. Can view nationally or select a specfic state to review. By NatureServe and National Geographic.
  52. Landscope Colorado -

    Learn more about the natural geography, threats & issues, plants & animals, ecosystems & habits and conservation efforts and opportunities in Colorado.
  53. Library of Congress Webcasts -

    Subjects cover biography, education, government, religion, science, etc.
  54. Life Science Guide -

    From How Stuff Works - learn about animals, conservation, evolution, genetics & heredity, human biology, and plants.
  55. Mars Exploration Rover Mission -

    Mars Exploration Rover Mission from NASA shows news, images, science, technology, events, and multimedia.
  56. Mathway -

    A problem-solving site that covers basic math, pre-algebra, algebra, trigonometry, precalculus, calculus, and statistics.
  57. MIT World -

    Provides on demand video of significant public events at MIT. Includes more than 800 videos covering a wide range of topics.
  58. NASA -

    National Aeronautics and Space Administration.
  59. NASA Human Space Flight -

    Current and past Space Shuttle and International Space Station missions.
  60. National Academies Press Online Books -

    All PDF titles are now available for free download. Topics cover a wide range of subjects, including biographies, sciences, computers & information technology, education, food & nutrition, health & medicine, and much more! Click on a title to see if it is available for a free download, also includes research tools, online videos, podcasts, etc.
  61. National Geographic -

    Find information on photography, animals, environment, travel, adventure, and more!
  62. National Inventors Hall of Fame -
  63. National Marine Sanctuaries Media Libraries -

    Large collection of photos and video clips from "America's underwater treasures." Searchable by keyword, format, category, etc. Main photo galleries consist of human impact, fish portraits, maritime heritage, education & outreach, ocean forests, and scenic beauty.
  64. National Space Symposium -

    "The 29th National Space Symposium is slated for April 8-11, 2013, at The Broadmoor Hotel in Colorado Springs."
  65. Nine Planets -

    An overview of the history, mythology, and scientific knowledge for planets, moons, and other objects in our solar system.
  66. NOVA -

    Science/documentary series on PBS.
  67. Nuclear Facilities -

    Lists all facilities in the United States, search by region or name. Also within this site, find information on nuclear materials, radioactive waste, nuclear safety, and more. From the United States Nuclear Regulatory Commission.
  68. Online Conversion -

    Volume, frequency, cooking, clothing, atronomical, angles, etc.
  69. Peterson Air & Space Museum -
  70. Physical Science Guide -

    from How Stuff Works - learn about the properties and structure of matter, space and time, as well as major concepts in physical science.
  71. Physics.org -

    Explore handpicked websites on physics topics, information on studying physics in college, careers in physics, and news.
  72. Planetary Fact Sheets -

    From NASA - includes bulk, orbit, atmosphere, etc.
  73. Plate Tectonics -

    From Answers.com.
  74. Science Buddies -

    Free science fair project ideas, answers, and tools for serious students.
  75. Science Daily -

    View current and archived news stories in all branches of science.
  76. Science Experiments -

    Links to the PPLD Kids Web.
  77. Science Fair Central -

    Comprehensive guide to creating a science fair project. From Discovery Education.
  78. Science Fair Project Resource Guide -

    Choosing a topic, sample projects, resources, tips & tricks. Start to finish: taking you through all the steps from Internet Public Library.
  79. Science Fair Projects -

    If you need help with project ideas, tips, guidelines, and questions & answers, try this site.
  80. Science Fair Projects -

    Links to PPLD Teens.
  81. Science Links from Yahoo! -

    Thousands of links to science related websites through Yahoo!
  82. Science of Cooking -

    The science behind food and cooking: recipes, activities, history and culture.
  83. Science.gov -

    Authoritative science information from U.S. Government agencies.
  84. Scientific American: Education -

    Includes scientific experiments for children and adults, volunteer information for research projects, etc.
  85. Scirius.com -

    The most comprehensive science-specific search engine on the Internet.
  86. Scirus -

    Search for not only journal content but also scientists' homepages, courseware, pre-print server material, patents and institutional repository and website information.
  87. Secret Worlds: The Universe Within -

    From the Milky Way to quarks in successive orders of magnitude.
  88. Sloan Digital Sky Survey -

    A project to make a map of the entire universe.
  89. Smithsonian Images -

    Images from current exhibits, events, and historic collections at the Smithsonian. Photos cover subjects such as air & space, American history, animals, gems & minerals, marine life, military history, nature, the Presidency, etc.
  90. Solar System Exploration from NASA -
  91. Solar System Simulator -

    Solar system simulator shows, maps, artwork and spacecraft models.
  92. Space and Solar System Guide -

    From How Stuff Works - includes information on the solar system, space exploration, and spacecrafts.
  93. Space Foundation Visitors Center -
  94. Sports Science -

    Discusses the science of baseball, skateboarding, surfing, cycling, hockey and more.
  95. StarDate -

    The Moon phases, meteor showers, constellation guide and planet viewing, space in a nut shell.
  96. Technology & Everyday Science Guide -

    From How Stuff Works - learn about the science of commonly used objects, computers and electronics.
  97. TEDTalks -

    Free videos of talks and performances at TED conferences, covering a wide range of topics.
  98. The Biology Project -

    From the University of Arizona - provides an online interactive resource for learning biology.
  99. The World's Biomes -

    Learn about the 5 biomes and their importance.
  100. U.S. Board on Geographic Names -

    Database from the USGS to research how rivers, mountains, lakes, buildings, etc. got their name. Features domestic names, foreign names, undersea features, and Antarctic names.
  101. U.S. Geological Survey (USGS) -
  102. U.S. Government Photos and Images -

    Photos and images sorted into the following topics: defense and international relations, environment, energy, and agriculture, general government, health and nutrition, history, arts & culture, money and taxes, public safety and law, and science and technology.
  103. Udacity -

    Free online courses including computer science, logic & discrete mathematics, programming languages, design of computer programs, algorithms, software testing, intro to physics, web application engineering, artificial intelligence, intro to statistics, and applied cryptography.
  104. USGS Education -

    Find education resources from the USGS for Grades K-6, 7-12, or Undergraduate. Includes online lectures, videos & animations of popular topics, maps, images, and more.
  105. Virtual Solar System -

    Images, facts, planets and satellites, from National Geographic.
  106. Volcano Hazards Program -

    From USGS - includes current volcano alerts, lessons on volcanoes, FAQs, images, hazards, and more.
  107. Volcanoes of the World -

    Find a volcano by region, name, eruption date, or browse through the global volcano lists. Also includes chronological listing of dates and explosive magnitudes of large eruptions during the past 10,000 years.
  108. WaterWatch -

    View maps with water conditions including streamflow, flood, drought, past flow/runoff, and more. Also includes annual summaries. From the USGS.
  109. Weather Information -

    Weather Information, Climate Studies, Information on Tornadoes, Lightning, Hail and Snow, and much more. Links to the Weather section of Recommended Websites.
  110. WebElements.com -

    Periodic table of elements. Also, learn about atomic structure, properties, compounds, uses for elements.
  111. WebMath.com -

    Free on-line mathematics tutor designed to assist students of all ages.
  112. Welcome to the Planets -

    From NASA, great pictures and profiles of the planets.
  113. Why Are Things Colored? -

    How light is made, lost, or moved, as well as colorblindness, animal vision, etc.
  114. Windows to the Universe -

    Explore our planet, the solar system, astronomy and the universe, plus other information from scientific, artistic, cultural, and historical sources. Rich in information and images.
  115. WorldWideScience.org -

    Global science gateway connecting you to national and international scientific databases and portals.
  116. YouTube EDU -

    Videos and channels from YouTube college and university partners, including Dartmouth, Stanford, USC, and MIT.