Science & Nature
1439 sites
Subcategories:
- Astronomy & Space (396)
- Chemistry (8)
- Earth Sciences (26)
- Biology (79)
- Physics (30)
- Mathematics (59)
- Weather & Climate (104)
- Amateur Radio (682)
- Electronics (47)
https://www.qsl.net/w5wx
A QSL.net-hosted personal page for amateur radio operator W5WX, accessible via the QSL.net directory structure. The site appears to be a file index for a ham radio enthusiast's web presence on one of the most popular amateur radio hosting services.
https://www.astronomy.org/
Gary A. Becker's astronomy hub at Moravian University offers original astrophotography, weekly starwatch articles, and curated links to astronomy, weather, and science resources. Highlights include stunning lunar eclipse photos and decades of accumulated observational content dating back to 1996.
https://hamqsl.com/
Paul Herrman (N0NBH) built this comprehensive resource for ham radio operators tracking HF propagation conditions, offering free solar-terrestrial data widgets, banners, and tools that can be embedded in any website. Visitors will find online calculators for SFI/SN conversion, K-Index to signal noise, Aurora latitude tools, MUF/LOF prediction maps, and live solar flux and sunspot data updated every few hours.
https://asgh.org/legacy/links.htm
The Astronomical Society of Greenwich Hills (ASGH) maintains this curated links page connecting amateur astronomers to periodicals, regional astronomy clubs, observatories, equipment suppliers, and NASA educational resources. A thorough reference hub for stargazers in Connecticut and New England, it lists dozens of affiliated clubs and organizations alongside tools for both hobbyists and kids.
http://pupfish.net/dsac
The Desert Springs Action Committee (DSAC) is a volunteer group dedicated to hands-on aquatic conservation and education, focusing on desert fish habitats in Ash Meadows National Wildlife Refuge, Death Valley National Park, and Devils Hole. The site also features TKphotos digital image collections covering desert springs, aquarium fish, and regional wildlife.
https://weather.cod.edu/
NEXLAB at College of DuPage is a meteorology lab and weather data hub offering satellite imagery, radar, numerical models, and local forecasts for the Illinois/DuPage region. Run by COD's meteorology program, it also supports storm chasing activities, academic coursework, and real-time campus weather conditions.
https://sfarc.org/
The San Francisco Radio Club (SFRC) is the hub for ham radio enthusiasts in the Bay Area, offering information on club meetings, repeaters, nets, and a rich archive of events like Field Day activations and SOTA expeditions. With resources covering everything from licensing classes to equipment lending and digital modes like DMR, D-STAR, and APRS, it serves both newcomers and seasoned operators alike.
http://bcfmca.bc.ca/
The British Columbia Frequency Modulation Communications Association (BCFMCA) is a registered Canadian amateur radio charity operating VHF, UHF, and microwave repeaters across British Columbia, including FM, DMR, IRLP, and D-STAR modes. Visitors can check live system status, explore the repeater directory, browse coverage maps, and find membership and donation information for this active ham radio club.
https://chinalakeastro.org/
The China Lake Astronomical Society (CLAS) is a community astronomy club based in Ridgecrest, California, taking advantage of some of the darkest skies in the United States near Death Valley. The site offers information on monthly meetings, star parties at their dark sky site on Brown Road, newsletters, and membership for skywatchers in the Indian Wells Valley.
https://home.adelphi.edu/~stemkoski/mathematrix/index.html
Mathematrix, created by Lee Stemkoski at Adelphi University, explores the playful and lesser-known side of mathematics through topics like polyominoes, Rubik's Cube, fractals, Conway's Game of Life, and higher dimensions. Accessible to curious minds at any level, the site blends mathematical art, humor, poetry, and hands-on puzzles to make recreational math genuinely entertaining.