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://ei7gl.blogspot.com/
John, EI7GL, runs this detailed amateur radio diary chronicling propagation experiments, solar cycle activity, and DX contacts across a wide range of frequency bands from Medium Wave to Microwaves. With thousands of labeled posts covering callsigns from around the world, solar flux data, and band opening reports, it is an invaluable log for radio enthusiasts following HF and VHF propagation conditions.
http://wa3key.com/collins.html
WA3KEY's Virtual Collins Radio Museum, created by Norman Drechsel, catalogs the full range of Collins Radio Company amateur equipment from 1946 through 1995, with individual pages for transmitters, receivers, transceivers, and accessories. A rich reference for ham radio collectors and restorers, the site also includes advertisement archives, parts and service vendor listings, and collector club resources.
http://vdazone.org/hamlinks.html
Compiled by the Northern Berkshire Amateur Radio Club (NoBARC), this extensive link directory covers virtually every corner of amateur radio, from ARRL resources and antenna plans to ATV, SSTV, antique radios, and weather satellite imagery. With over 1,300 curated links organized into dozens of categories, it serves as a comprehensive jumping-off point for ham radio operators of all interests.
https://dra73.org/
The Delaware Repeater Association (DRA) is a ham radio club founded in 1973 that maintains repeaters across Delaware and holds quarterly in-person meetings at the Route 40 Diner in Bear, DE with a Zoom option for remote members. The site covers club membership, dues, leadership, meeting schedules, and links to regional amateur radio resources including ARES groups and VE testing.
https://www.qsl.net/9m6aac/old/aacmem.htm
The Hillview Gardens Amateur Radio Club (9M6AAC), based in Keningau, Sabah, Malaysia, maintains this membership directory listing callsigns and contact details for its globally dispersed ham radio members. The roster spans operators from dozens of countries, reflecting the club's mission of promoting worldwide friendships through amateur radio.
https://physicspages.com/
PhysicsPages is a detailed self-study companion covering classical mechanics, quantum mechanics, electrodynamics, relativity, string theory, and more, written with honest, jargon-free explanations that avoid the dreaded 'obviously' of typical textbooks. The creator presents rigorous, math-heavy notes designed for university students or independent learners working through structured physics topics.
https://lynkeos.sourceforge.io/
Lynkeos is a SourceForge-hosted software project dedicated to processing planetary images captured with webcams, aimed at amateur astronomers looking to enhance their astrophotography. The tool focuses on stacking and refining low-quality frames to produce sharper planetary images, making it a niche but valuable resource for hobbyist planetary imagers.
https://hfpropagation.com/
A continually updated reference tool for ham radio operators providing usable HF propagation frequencies and forecasts from major U.S. base cities to regions around the world. Color-coded charts, ionograms, and geomagnetic and solar data make it a practical real-time resource for planning amateur radio contacts.
https://berthub.eu/articles/posts/amazing-dna
Bert Hubert's long-running article explains DNA biology through the lens of a computer programmer, drawing analogies between genetic code and software concepts like error correction, compression, and the halting problem. Originally written in 2001 and revised multiple times since, it became popular enough to spawn a two-hour conference presentation and an upcoming book.
https://eskimo.com/~oolon/paladin/index.html
The Paladin Contest Club is a casual amateur radio group centered around sharing a special club callsign for contests and mini-DXpeditions, with no formal score competition against other clubs. The site offers access to club bylaws, a member roster, contest scores, and logs, all coordinated by Jack Fleming (WA0RJY).