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://www.qsl.net/wb4hfn
WB4HFN is an amateur radio resource site covering antenna construction, digital communications, equipment modifications, and vintage R.L. Drake radio gear from the 1960s and 70s. The site also features a UHF repeater system on 443.200 MHz serving northern Massachusetts and southern New Hampshire, along with local weather data and ham radio club links.
http://nightskylive.net/
NightSkyLive.net appears to be a site dedicated to live or near-live views of the night sky, likely featuring sky cameras or astronomy broadcasts. The domain name strongly suggests a focus on real-time celestial observation for stargazers and astronomy enthusiasts.
http://mineralzine.chez.com/
Mineral Webzine is a bilingual French-English non-commercial online magazine dedicated to rockhounds, mineral collectors, and geology enthusiasts. Featuring photographs of specimens like garnet, wulfenite, and cinnabar contributed by collectors from Canada and France, it serves as a reference for mineralogy, crystallography, and gemology.
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://hypertextbook.com/chaos
The Chaos Hypertextbook is a deep educational resource covering chaos theory, fractals, strange attractors, and fractal dimension with clear explanations aimed at making complex mathematics accessible to a broad audience. Organized into chapters covering iteration, bifurcation, Julia sets, Mandelbrot sets, and nonlinear dynamics, it reads like a beautifully structured online textbook that would captivate anyone curious about the mathematics underlying unpredictable systems.
http://casswww.ucsd.edu/archive/public/tutorial/History.html
Gene Smith of UC San Diego's Center for Astrophysics and Space Sciences presents a detailed tutorial on the history of astronomy, tracing human observation of the skies from Stonehenge and ancient agrarian cultures through Pythagoras, Aristotle, Aristarchus, Copernicus, Kepler, and Galileo. Rich with links to related topics like archaeoastronomy, eclipse prediction, and the Music of the Spheres, this page is part of a broader astronomy education series hosted by UCSD.
http://csgnetwork.com/hamfreqtable.html
CSGNetwork's Amateur Radio Frequency Table is a comprehensive reference listing all US ham radio band allocations, including mode restrictions, calling frequencies, and licensing class privileges across bands from 160 meters to microwave. Part of a larger calculator and reference site, it also links out to related frequency tables for CB, FRS, marine VHF, cellular, and cordless phone bands.
https://nssl.noaa.gov/users/brooks/public_html/tornado
Harold Brooks of NOAA's National Severe Storms Laboratory presents a detailed statistical analysis of tornado climatology in the United States, examining frequency, death rates, and the challenges of detecting climate-related trends in the historical record. The site features data visualizations and Markov chain modeling of significant tornado days, with a particular focus on putting the large 1998 tornado death toll into historical perspective.
https://qsl.net/ct1nmv
The Radio Scouting Department (Departamento de Rádio Escutismo) of the Moinhos de Vento Scout Group in Portugal claims to be the first Portuguese page dedicated to radio scouting, covering Jamboree-on-the-Air (JOTA), JOTI, QSL galleries, frequencies, repeaters, and amateur radio specialties for scouts. With dozens of sections including DXCC, IOTA, telegraphy, scout call books, and historical records, this is a rich resource for the intersection of amateur radio and the scouting movement.
https://ure.es/
The Unión de Radioaficionados Españoles (URE) is Spain's national amateur radio association and the Spanish section of the IARU, serving as the official body representing ham radio operators across the country. The site offers licensing information, exam guidance, contest calendars, QSL traffic resources, a webcluster, a members-only area, and a regularly published magazine called Radioaficionados.