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://ncarrl.org/ares
The official site for North Carolina ARES (Amateur Radio Emergency Service) and AUXCOMM, coordinating amateur radio operators across all 100 NC counties for emergency communications support. It features a comprehensive county-by-county coordinator directory, training requirements, FEMA integration guidelines, and links to ARRL emergency planning documents.
https://solarpower.guide/
Bob Robertson's hobby site is a sprawling reference on solar power, covering everything from basic definitions and how solar panels work to educational guides for kids and van-life solar setups. With dozens of articles on renewable energy topics, it reads like a one-man encyclopedia built by a retiree passionate about the subject.
https://ring.fediverse.radio/
Fediverse.Radio WebRing connects 35 amateur radio enthusiast sites whose operators are active on the Fediverse, the decentralized social network. Run by M0YNG, a licensed radio amateur in Gloucestershire, the ring makes it easy to discover blogs, personal pages, and resources from ham radio operators around the world.
https://roanestate.edu/pages/obs/index.htm
The Tamke-Allan Observatory at Roane State Community College in East Tennessee hosts public stargazes, telescope-making workshops, and astrophotography events for students and amateur astronomers alike. Visitors can explore images of nebulae and planets captured through the observatory's equipment, find astronomy calendars for the Knoxville area, and connect with the local ORION observing group.
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.
http://wadenaham.org/
The Wadena Area Amateur Radio Club serves ham radio enthusiasts in the Wadena, Minnesota region, providing a community hub for local operators. This club site connects members and promotes amateur radio activity in the area.
https://cut-the-knot.org/
Created by Alexander Bogomolny starting in 1996, Cut the Knot is a massive encyclopedic collection of interactive mathematics covering geometry, algebra, probability, puzzles, proofs, and much more, built over decades until his passing in 2018. With thousands of pages, interactive Java applets, Olympiad problems, and articles spanning all levels of math, it stands as one of the most beloved and comprehensive math resources ever built on the early web.
http://oltw.blogspot.com/
Rachel Sussman's project documenting the oldest living organisms on Earth, from ancient chestnut trees to Siberian actinobacteria, combines scientific curiosity with fine art photography. Each post chronicles her travels to find and photograph these extraordinary subjects, paired with reflections on deep time, survival, and the nature of life itself.
https://gutenberg.org/cache/epub/11587/pg11587-images.html
A digitized 1922 educational text by Charles Lathrop Pack, President of the American Tree Association, covering all aspects of forestry from how trees grow to national forest policy and the dangers of fire and disease. Hosted on Project Gutenberg, this freely available ebook spans 18 chapters and includes period photographs of forests, rangers, and fire damage, making it a fascinating historical resource on early American conservation thought.
https://lostartoflogarithms.com/
Charles Petzold's web-book-in-progress explores the history, utility, and mechanics of logarithms, from their origins in 400-year-old mathematical tables to slide rules and spherical trigonometry. With over 30 chapter-length pages covering topics like the Book of Vlacq, log-log scales, and John Napier's life, this is a rich and deeply researched labor of love for math history enthusiasts.