Science, Nature & Technology

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General Science

Physical Sciences and Mathematics

Earth and Climate

Biology and Natural History

Technology

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

National Science Digital Library
Online educational resources for teaching and learning, with an emphasis on science, technology, engineering, and mathematics (STEM) education.

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

Story of Mathematics 
Mathematical history and biographies

NASA Image and Video Library
Discover NASA's intergalactic multimedia collections--images, videos, and audio. NASA en español

Hubble Space Telescope
Latest news; science and cultural impacts; spectacular multimedia library; education resources including online activities, fact sheets. What did Hubble see on your birthday?

Webb Space Telescope 
Explore the universe with Webb--latest news, science, multimedia, fact sheets. En español

Earth and Climate

The Encyclopedia of Earth 
Expert-reviewed content

U.S. Geological Survey MapView 
Map-based search for downloading geologic maps, help is available as a link on the main page
See an example Gold Hill, Boulder County, CO

Colorado Geological Survey 
Resources for avalanche information and other geologic hazards, 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
Detailed overview of our changing climate--vital signs dashboard, data resources, images of change. En español

NOAA: National Oceanic and Atmospheric Administration 
Guide to locating climate and weather information/data

NOAA: Paleoclimatology Data 
Climate data through geological history, from natural sources such as tree rings, ice cores, corals, stalagmites, and ocean and lake sediments.

U.N. Environment Programme Network
International efforts to mitigate root causes of the triple planetary crisis:  climate change; nature, land and biodiversity loss; pollution and waste.  

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
Resources for animal health and welfare; agricultural economics and trade; farming and agricultural production systems; human nutrition and food safety; rural communities; gardening. Search PubAg to find full-text articles and citations to peer-reviewed journal articles in the agricultural sciences.

All About Birds 
From the Cornell Laboratory of Ornithology

Avibase: the World's Bird Database 
Extensive database of birds of the world. En español

Denver Museum of Nature and Science 
Exhibits, films, other programs and events, including virtual classroom and teacher professional development programs.

American Museum of Natural History

University of California Museum of Paleontology 
Fossils, news, online exhibits, more

Technology

HowStuffWorks

How Products are Made 
Explanations of how many products are manufactured, includes a section of inventor biographies