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://journal.jcampbell.ca/
Jim Campbell (VE1KM) keeps this personal journal documenting his amateur radio adventures, including Parks on the Air activations, balun testing, 3D-printed ham radio accessories, and Morse Code operating tracked via the Reverse Beacon Network. Live feeds of his recent QRZ contacts, POTA stats, and Mastodon posts make this a genuinely active ham radio log worth bookmarking.
https://kk4das.blogspot.com/
KK4DAS is a ham radio blog by an enthusiastic homebrew builder documenting the construction of transceivers, antennas, and test equipment from scratch. Posts dive deep into technical details like crystal ladder filters, diode ring mixers, and VFO modules, making it a treasure trove for QRP and homebrew radio enthusiasts.
https://ento.csiro.au/biology/fly/fly.html
Developed by CSIRO Entomology researchers, this anatomical atlas provides detailed visual and educational reference material covering the morphology of flies (Diptera), originally built in Flash and converted to HTML in 2023. A collaboration between CSIRO and ABRS, it includes identification keys and anatomical glossaries for fly families found in Australia, making it a valuable tool for entomologists and biology students alike.
http://metroplex.org/
The Metroplex Amateur Radio Association (ARA) out of Fort Lee, NJ maintains this page listing their repeater frequencies, EchoLink node information, and club officers. A historic photo of core members from 2000 honors the club's founder, Alex Magocsi W2OV, and a membership application form is available for prospective hams.
http://websdr.org/
WebSDR.org is the home of the WebSDR project, a network of software-defined radio receivers accessible via a web browser, allowing anyone to tune into shortwave, amateur radio, and other RF signals from around the world. The site connects users to SDR servers hosted by universities, radio clubs, and hobbyists, making radio listening accessible without any special hardware.
http://kellysky.net/
Al Kelly's dedicated astrophotography site showcases stunning CCD images of galaxies, nebulae, star clusters, and solar system objects captured with equipment including a Celestron CGE 1400 telescope and Orion Parsec 8300C camera. Beyond the image galleries, the site offers a CCD instruction manual, a G2V color calibration article, and links to fellow astrophotographers, making it a valuable resource for amateur astronomers interested in CCD imaging.
http://panther-observatory.com/
Johannes Schedler's Panther Observatory showcases stunning astrophotography covering the moon, sun, planets, comets, deep sky objects, and constellations, including imaging results from a semi-professional remote observatory at CTIO in Chile. The site also invites visitors to stay at a guest house in Altaussee, Austria, offering dark skies and alpine observing facilities.
http://hamgallery.com/
The K8CX Ham Gallery, run by operator K8CX, is a sprawling archive of ham radio history featuring a QSL Card Museum, rare DX sound clips spanning decades from the 1930s onward, and photo galleries from the legendary Dayton Hamvention going back to 1957. With searchable databases, DXCC entity tracking, Hall of Fame lists, and DXpedition galleries, it is an exceptional resource for amateur radio enthusiasts and historians alike.
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://weca.org/
The Westchester Emergency Communications Association (WECA) has been serving the Hudson Valley region through amateur ham radio since 1972, with a base repeater on 147.06 MHz. The site offers an extensive range of resources including APRS live mapping, ARES/RACES emergency communications info, FCC license exam prep, hamfests, local repeater listings, and SKYWARN weather spotting details.