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://pages.mtu.edu/~jaszczak/graphite.html
John A. Jaszczak, a physicist at Michigan Technological University, has compiled a comprehensive reference on graphite mineralogy covering crystal structures, properties, spirals, spherical forms, and notable localities from around the world. The site features atomic force microscopy images, links to published research papers, and detailed documentation of unusual graphite occurrences including cones, pseudocubes, and meteoritic graphite.
https://faraday.physics.utoronto.ca/GeneralInterest/Harrison/Flash
Created by a University of Toronto physicist, this collection features 99 Flash animations covering topics from Quantum Mechanics and Relativity to Chaos and Fluid Mechanics, making abstract physics concepts visually intuitive. A bonus tutorial teaches how to build your own physics animations in Flash, and the animations are available in multiple languages under a Creative Commons license.
https://r-clarke.org.uk/
A comprehensive amateur astronomy resource covering the monthly night sky, planetary facts, eclipse details, Messier objects, telescope guides, and an astro dictionary for beginners. The site also extends into amateur radio with club listings, beginner guides, and rally information with GPS postcodes.
https://kc4gzx.tripod.com/kc4gzx/rptga02m.htm
KC4GZX is a comprehensive ham radio resource covering Georgia 2-meter repeater directories, with listings extending across neighboring states including South Carolina, North Carolina, Tennessee, Alabama, and Florida. The site also features a Northeast Georgia ham operator directory organized by city, DIY electronics projects covering antennas, amplifiers, transmitters, and test equipment, plus a hamfest schedule.
https://rarchams.org/wp
The Rochester Amateur Radio Club (RARC) is an ARRL-affiliated nonprofit based in Rochester, Minnesota, dedicated to advancing amateur radio knowledge and providing public service support to the local community. The site features club meeting minutes going back to 2019, ARES emergency communications resources, Skywarn weather dashboards, repeater information, and a regularly published newsletter called the Hamster.
https://harc.net/
The Huntsville Amateur Radio Club (HARC) is a 501(c)(3) nonprofit based in Huntsville, Alabama, dedicated to educating and training members in amateur radio with a focus on emergency communications support. The site offers access to club resources including a newsletter, repeater and net information, a classifieds section, SKYWARN and ARES/RACES emergency programs, and a DX club.
http://aleph0.clarku.edu/~djoyce/java/compass
David E. Joyce of Clark University presents a detailed mathematical exploration of compass-only geometric constructions, proving that a straightedge is unnecessary for any Euclidean construction. The site covers circle inversion, stereographic projection, inversive geometry, and involutory quandles, drawing on the historical work of Mohr and Mascheroni.
http://laughingpoliceman.com/
The Laughing Policeman Wireless Society (LPWS) is a long-running alternative amateur radio club founded in 1978, dedicated to celebrating the humorous and absurd side of the hobby through audio recordings, court cases involving radio pirates, repeater antics, and radio buffoonery. The site is packed with sections covering pirate radio, CB court cases, Russian jammers, CTCSS tones, and even a "History of Swearing," making it a uniquely entertaining corner of the amateur radio world.
http://rockinglweather.com/
The Rocking L Ranch Weather Station is a personal weather monitoring hub located in Nampa, Idaho, run by amateur meteorologist NV6B using a Davis Instruments Vantage Pro 2 Plus system. Visitors can explore live conditions, NEXRAD Doppler radar maps, yearly rainfall totals, webcam feeds, and a 7-day forecast history for the Canyon County area.
http://radiowrench.com/sonic/index.html
A long-running free resource archive started in 1997 offering downloadable manuals, service documents, and technical diagrams for VHF/UHF radios, repeaters, antennas, and related RF equipment. The site hosts PDFs covering everything from GE MVP repeater manuals to tone decoder boards and duplexer specs, making it a valuable reference for amateur radio operators and radio technicians.