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)
http://cat.boffosocko.com/
A collaborative study group blog documenting UCLA Extension's 2015 Category Theory course led by Professor Michael Miller, covering abstract algebra, functors, and related mathematical structures. Participants followed a structured syllabus across multiple chapters, sharing notes, resources, LaTeX diagrams, and meeting summaries over the summer term.
https://www.qsl.net/w5gfc
The W5GFC Greers Ferry Amateur Radio Club serves ham radio enthusiasts in the Ozark foothills of Arkansas, offering club news, repeater listings, VE exam info, QSL cards, and a photo album. Founded in the 1970s, this active club also coordinates emergency communications and hosts a weekly net on 147.330+.
https://rc-astro.com/photography.php
Russell Croman's astrophotography site showcases stunning deep-sky images including nebulae, galaxies, star clusters, and solar system objects captured with professional-grade equipment. With sections organized by celestial type and additional resources on equipment and publications, this is a richly curated portfolio of night-sky photography spanning over two decades.
http://gnarc.org/
The Greater Norwalk Amateur Radio Club (GNARC) is a Connecticut-based ham radio club serving the Norwalk area, featuring meeting minutes, membership info, repeater listings, and event photos. With archives going back to 2013 and active records of club officers, field day activities, and newsletters, this site offers a thorough look at an engaged local amateur radio community.
https://vvara.org/
The Verde Valley Amateur Radio Association (VVARA) serves ham radio enthusiasts in North-Central Arizona, hosting regular club meetings, training presentations, and multiple weekly nets including trivia and rag chew sessions. The site also features a live weather station and camera feed from Mingus Mountain, making it a useful local hub for both radio operators and weather watchers.
https://irts.ie/cgi/index.cgi
The Irish Radio Transmitters Society (IRTS) is Ireland's national amateur radio organization, offering licensing guidance, club directories, contest calendars, and membership services for ham radio enthusiasts across the country. Affiliated with the International Amateur Radio Union, the site serves as a central hub for Irish operators with resources covering repeaters, beacons, DXCC standings, awards, and emergency communications.
https://qsl.net/kb1ckf/ham_radio_links.htm
Mike (KB1CKF) has assembled a comprehensive ham radio links page covering SATERN emergency communications chapters, Massachusetts amateur radio clubs, ARRL resources, repeater directories, and major radio equipment manufacturers. A handy reference for New England amateur operators, with particular emphasis on emergency radio networks and local clubs in the Eastern Massachusetts area.
http://arc.iki.rssi.ru/eng/index.htm
The Space Research Institute (IKI) of the Russian Academy of Sciences is Russia's principal organization for robotic space research, designing scientific instruments and leading missions such as Spektr-RG, ExoMars, and the Luna lunar program. Founded in 1965, this archived English-language site offers institutional history, department structure, mission summaries, and links to international conferences spanning decades of Soviet and Russian space science.
https://michaelbach.de/ot/index.html
Michael Bach's massive collection of 154 optical illusions and visual phenomena combines interactive experiments with scientific explanations grounded in vision research and perceptual psychology. Each illusion is presented with thoughtful commentary on how the brain's visual shortcuts create misleading interpretations, making this an exceptional resource for anyone curious about how human perception actually works.
http://berfield.com/main.html
Scott Berfield's personal homepage covers his passion for amateur astronomy and CCD imaging alongside video game production and family history for the West Coast Berfields. The astronomy and CCD content takes top billing in the meta description and keywords, making it the site's defining draw for stargazers and hobbyist imagers.