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/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+.
http://bratsatv.org/
The Baltimore Radio Amateur Television Society (BRATS) is a non-profit amateur radio club based in Baltimore, Maryland, focused on ATV (amateur television) repeaters, emergency communications, and public service. The site features club news, meeting announcements, technical writeups on their ATV repeater revival project, and information on joining the organization.
http://hamradio.dk/
The official site of EDR København, the Copenhagen chapter of the Danish Amateur Radio Society, operating under the callsign OZ5EDR. A hub for Danish ham radio enthusiasts, covering club activities, news, and resources for the amateur radio community in Copenhagen.
https://oeis.org/
The OEIS is a massive searchable database of over 393,000 integer sequences, maintained by the OEIS Foundation and originally created by mathematician Neil Sloane. Researchers, students, and math enthusiasts can look up sequences by entering numbers to identify patterns, explore combinatorics, and discover connections across mathematical disciplines.
https://m0yng.uk/
Christopher M0YNG is a radio amateur based in Gloucestershire whose personal site covers amateur radio, solar and battery tracking, self-hosted tech, and small computing projects like the Penkesu Tiny Computer. The site is notably available via Gopher, Gemini, and Tor in addition to HTTP, making it a fascinating example of smolnet philosophy in practice.
https://his.com/~jrusso/ham.html
Jim and Karen's joint ham radio page for callsigns W4KRN and K4JJR features their station setup, ham radio links, and a reference to the Dayton 2000 hamfest. The site also participates in the Amateur Radio Webring and includes a local weather widget for Warrenton, Virginia.
https://astronomy-links.net/
Clark M. Thomas of Roanoke, VA has assembled one of the most comprehensive astronomy link directories on the old web, covering everything from cosmology and black holes to amateur CCD imaging and deep sky observing. Alongside the curated links, Clark shares his own original essays on topics ranging from dark matter and primordial black holes to UFO phenomena and climate change, making this both a jumping-off point and a destination in itself.
https://gogeometry.com/
GoGeometry, created by Antonio Gutierrez, offers over 1600 illustrated geometry problems alongside interactive lessons and tutorials suited for both students and teachers. The site blends mathematical rigor with cultural touches, weaving in references to Incan heritage, Machu Picchu, and the golden ratio to make geometry visually engaging and globally inspired.
http://ukesca.org/
The UK ESCA Users Group is a professional forum connecting scientists from academia and industry around Electron Spectroscopy for Chemical Analysis and surface science, meeting twice yearly and publishing an online newsletter. The site offers an extensive guide to surface science techniques and acronyms, tutorials, online databases of binding energies and elemental properties, and a global directory of surface science laboratories.
http://nmia.com/~roberts/robert.html
Robert Smathers maintains this personal hub dedicated to TVRO (Television Receive Only) satellite reception, featuring links, schedules, mail lists, newsgroups, and dealer resources for satellite hobbyists. The site also touches on visual satellite observing and space topics, making it a useful reference point for backyard dish enthusiasts.