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://n5yk.tripod.com/
Randy Ashley (callsign N5YK) shares his personal homepage centered on amateur ham radio, with interests in contesting, 6 meter band, DXing, and RTTY operating from McAllen, Texas. The site also touches on his secondary hobbies of scuba diving and Dutch oven cooking, with links to local Rio Grande Valley ham radio clubs and related resources.
http://astrochemistry.eu/
Astrochemistry.eu, maintained by Guido W. Fuchs, serves as a collaborative hub for researchers in astrophysics and astrochemistry, covering observational, laboratory, and theoretical investigations of interstellar chemistry. Visitors can find featured news on prize-winning discoveries, upcoming conferences, job opportunities, and curated links to major databases, journals, and research networks worldwide.
https://www.qsl.net/wb3gck/index.htm
Craig LaBarge (WB3GCK) shares decades of ham radio experience dating back to 1974, with a focus on QRP (low-power) portable operations using CW and digital modes across HF bands. The site features field operation reports from parks and beaches, a project notebook, Morse code resources, and emergency communications materials for Chester County ARES/RACES.
http://calendarzone.com/
The Calendar Zone, created by Janice McLean, is a comprehensive categorized directory of calendar-related links covering art, celestial, cultural, religious, historical, and reform topics. With over 7 million visitors since 1999, it serves as a one-stop hub for anyone curious about calendar systems, moon phases, lunar cycles, and the history of timekeeping across cultures.
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.
http://theastropages.com/
The @stro Pages is a long-running amateur astronomy hub offering astrophotos, articles, telescope making guides, an observer's log, and a San Diego stargazing calendar. Packed with community features like discussion boards, a monthly newsletter, and links to deep-sky objects, it serves both beginners and experienced skywatchers.
https://atmos.uw.edu/marka/or.normals.html
Hosted by the University of Washington's atmospheric sciences department, this page presents Oregon's monthly climate normals for the 1971-2000 period, including mean precipitation, maximum temperature, and minimum temperature data by location. Visitors can click on map markers to explore station-level climate statistics across the state, making it a handy reference for weather researchers and outdoor planners alike.
https://w7yrc.org/
The Yavapai Amateur Radio Club (W7YRC) serves ham radio enthusiasts in the Prescott, Arizona area with license classes, repeater information, club events, and public service opportunities. The site offers a wealth of resources including study materials for license exams, a monthly newsletter called the YARC Signal, and details on events like Field Day and the Prescott Hamfest.
https://qsl.net/w6efb
The High Desert DX Association (HIDEXA) is a ham radio club based in the High Mojave Desert of California, dedicated to pursuing worldwide DX contacts and making friends around the globe via amateur radio. The site features DX bulletins, contest links, callsign search tools, and member resources including antenna guides, QSL card galleries, and a ham shack tour from webmaster K7HG.
https://sharc.net/
The South Hills Amateur Radio Club (SHARC) is a 501(c)(3) non-profit based in Pittsburgh, Pennsylvania, serving ham radio enthusiasts across the South Hills region with callsigns KS3R, N3WX, and W3PIT. The site offers detailed information on club repeaters, Field Day events, membership, VE testing schedules, and an extensive swap-and-shop classifieds section for amateur radio equipment.