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General Science
Scholarpedia
Peer-reviewed open-access encyclopedia, where knowledge is curated by communities of experts
Science.gov
Dozens of databases and thousands of websites providing authoritative federal science information
Wolfram Alpha: computational knowledge engine
Ask Wolfram Alpha your science and math questions
Eric Weisstein's World of Science by Wolfram Research
Covering Mathematics, Physics, Chemistry, Astronomy and Scientific Biography
World Wide Science: The Global Science Gateway
National and international databases and portals
Physical Sciences and Mathematics
The Feynman Lectures on Physics
Decades after their publication, these lectures are still one of the best overviews of physics
The Theoretical Minimum
Courses for the beginner in physics
HyperPhysics
Educational website covering many topics in physics and math
MacTutor History of Mathematics archive
Story of Mathematics
Mathematical history and biographies
NASA Image, Video and Audio Library
HubbleSite
Run by the Space Telescope Science Institute's Office of Public Outreach
Webb Space Telescope
The website for the successor to the Hubble Telescope
Earth and Climate
The Encyclopedia of Earth
Expert-reviewed content
USGS Mapview
Map-based search for downloading geologic maps, help is available as a link on the main page
Colorado Geological Survey
Resources for avalanche information, Colorado geology, energy resources, geologic mapping and more
National Weather Service
Data source for many weather sites, search by city or zip code for current conditions and short- and long-term forecasts
Weather Underground
Check out the Wundermap and historical data
WeatherSpark
Breakdown of average weather for locations around the world
NASA Climate page
Detailed overview of our changing climate
NOAA: National Oceanic and Atmospheric Administration
Resources to locate climate and weather data
NOAA: Paleoclimatology data
Climate change over geological history
U.N. Environment Programme Network focus on climate change
International efforts to mitigate global warming
Center for Climate and Energy Solutions
Works with diverse partnerships to meet climate and energy challenges, offers various facts and figures, reports and initiatives
Union of Concerned Scientists: Global Warming
Climate Action Tracker
Tracks the efforts of countries to reduce greenhouse gas emissions
Biology and Natural History
Biology Online: Life Science Reference
Answers to your Biology questions
USDA National Agricultural Library
Encyclopedia of Life
Research all known species
All About Birds
From the Cornell Laboratory of Ornithology
Avibase: the World's Bird Database
Extensive database of birds of the world
The TalkOrigins Archive
Scientific perspective on creationist claims
Denver Museum of Nature and Science
Visit the website of our city's esteemed museum
American Museum of Natural History
University of California Museum of Paleontology
Fossils, news, online exhibits, more
Technology
How Products are Made
Explanations of how many products are manufactured, includes a section of inventor biographies