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://sss-mag.com/smith.html
A comprehensive reference hub dedicated to the Smith Chart, the classic RF engineering tool invented by Phillip Smith of RCA, covering tutorials, software downloads, example charts, reference books, and curated links to related tools and pages. Visitors can explore the mathematical foundations of impedance matching, s-parameters, and microwave design through a well-organized collection of articles, Java applets, and PDF resources.
https://theastronomycafe.net/
An archived recreation of Dr. Sten Odenwald's legendary 'Astronomy Cafe' website from circa 2001, once a destination where a professional astronomer answered thousands of public questions about space, the universe, and infrared astronomy. The site preserves a nostalgic snapshot of early web science outreach, featuring Dr. Odenwald's books, his 'Ask the Astronomer' feature, and philosophical explorations of concepts like 'nothing' and the Big Bang.
https://plaws.net/
Peter Laws has maintained this personal page since 1994, with amateur radio as its clear centerpiece, including newsletters from the University of Arkansas Amateur Radio Club dating back to 1992 and numerous presentations and videos on topics like satellites, DXLab, and outdoor warning sirens. The site also touches on scanning, trains, and AI, but the depth of ham radio content spanning three decades makes it a genuine archive for radio enthusiasts.
http://alife.co.uk/essays/the_singularity_is_nonsense
Tim Tyler's essay from the Lotus Artificial Life site takes a critical look at the concept of the 'technological singularity,' arguing that exponential growth curves have no truly singular points and that futurists like Vinge and Kurzweil misuse the term. The piece is a thoughtful, technically grounded rebuttal complete with references to Kurzweil's graphs, Wikipedia, and related essays by other thinkers.
http://mathpuzzle.com/loyd
Ed Pegg Jr's digitized archive of Sam Loyd's 1914 'Cyclopedia of 5000 Puzzles, Tricks, and Conundrums' presents the classic puzzle book as a complete set of scanned page images freely available for download. This rare public-domain release preserves one of the most celebrated puzzle collections in mathematical history, making it an invaluable resource for recreational mathematics enthusiasts.
https://repeater-builder.com/
Repeater Builder is a dedicated resource for amateur radio enthusiasts focused on building, modifying, and maintaining repeater systems. The site dives into the technical side of ham radio infrastructure, making it a go-to reference for hobbyists who want to construct or upgrade their own repeaters.
https://gryffindors.com/sarina/rain
Nature's Shower is a fanlisting dedicated to rain, listed under the Nature category at The Fanlistings Network, where fans of rainy weather can join and be counted among 115 members. Part of a broader collective of nature-themed fanlistings including Snow, Waterfalls, and Seasons, it offers a cozy corner of the web for those who simply love the rain.
http://xastir.org/index.php/Main_Page
XastirWiki is the documentation hub for Xastir, an open-source APRS (Automatic Packet Reporting System) client that provides mapping, tracking, messaging, weather alerts, and Search & Rescue features over amateur radio and the internet. Built by contributors worldwide and licensed under the GNU GPL, Xastir supports multiple platforms and is a feature-rich tool for ham radio operators who rely on real-time digital packet reporting.
https://www.qsl.net/kc4gzx/kc4gzx/index.htm
KC4GZX is a ham radio enthusiast's site packed with homebrew DIY projects covering antennas, amplifiers, filters, transmitters, receivers, and test equipment. It also serves as a regional resource for Northeast Georgia amateur radio operators, featuring ham directories, repeater listings for multiple southeastern states, and hamfest schedules.
http://worldclimate.com/
WorldClimate.com is a comprehensive database of historical weather averages for over 85,000 locations worldwide, offering rainfall, temperature, and precipitation records spanning decades. Travelers, researchers, and curious minds can look up climate normals for cities from Bangkok to Lima, making it a handy reference for trip planning, relocation decisions, or general weather curiosity.