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://stormandsky.com/
Storm And Sky is a storm photography and weather resource featuring hundreds of photos of supercell storms, tornadoes, and other dramatic natural phenomena. Visitors can explore trip reports, tutorials, gear recommendations, stock images, and weather and space data, making it a destination for storm chasers and weather enthusiasts alike.
http://tornadoproject.com/
The Tornado Project is a comprehensive resource dedicated to tornado research, safety, history, and data, covering everything from the Fujita Scale to state-by-state tornado records and hurricane-related tornadoes. Visitors can explore tornado oddities, safety guides for various settings, historical records, and even tornado-themed games and crosswords, plus purchase books, DVDs, and posters.
http://hamradio.de/
Hamradio.de is a German-language community hub for amateur radio enthusiasts, offering a fleamarket for used equipment, forums, contesting resources, club directories, and software. With sections dedicated to awards, DX, and contests, it serves as a comprehensive gathering point for the German-speaking ham radio community.
http://starshadows.com/
Star Shadows Remote Observatory (SSRO) was a cooperative astro-imaging venture cofounded by Rick Gilbert, Jack Harvey, Steve Mandel, and John Pierce, producing deep-sky images from New Mexico and Cerro Tololo Inter-American Observatory in Chile from 2004 to 2018. The archived site offers access to their gallery, equipment details, and documents from over a decade of collaborative astrophotography.
https://metrocor.net/
MetroCor is the Metropolitan Coordination organization for amateur radio repeaters covering New York City, New Jersey, and surrounding counties, maintaining an extensive database of coordinated frequencies across bands from 10 meters through 23 centimeters. The site publishes detailed repeater coordination tables listing hundreds of callsigns, output and input frequencies, PL tones, and coordination status for the greater NYC metro area.
https://planetary.chem.tufts.edu/Phoenix/index.html
A page dedicated to NASA's Phoenix Mars Scout Mission, hosted on a Tufts University chemistry server, featuring launch videos including a close-up NASA recording and a team footage from Cocoa Beach in August 2007. It offers a glimpse into the excitement surrounding the Phoenix lander's launch, which went on to study the Martian arctic soil.
https://openphdguiding.org/phd2-log-viewer
PHD2 Guiding is the home of PHD2, a free and open-source autoguiding software used by astrophotographers to keep telescopes precisely locked on celestial targets. This page highlights a log file viewer tool developed by Andy Galasso, which helps users visualize guiding performance and diagnose tracking issues from their PHD2 guide logs.
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://w8dc.org/
The Grand Rapids Amateur Radio Association (GRARA), callsign W8DC, is a Michigan-based amateur radio club offering meetings, license testing sessions, repeater access, and annual events like Field Day and a Hamfest. The site keeps members informed with meeting announcements, minutes, newsletters, and membership information for the greater Grand Rapids area.
http://qrp.gr/index.htm
SV3ORA is a Greek amateur radio operator's personal site packed with original electronics projects, HF radio circuit designs, and hands-on repair guides for classic gear like Tektronix oscilloscopes, Collins radios, and Heathkit equipment. The site features hundreds of projects spanning antenna designs, tube circuits, QRP transmitters, and vintage test equipment restoration, all presented in classic Web 1.0 style.