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://skccgroup.com/
The Straight Key Century Club (SKCC) is a worldwide organization dedicated to CW (Morse code) enthusiasts who use traditional straight keys, bugs, and side-swiper keys on the air. With nearly 31,000 members and a rich program of sprints, awards, sked pages, and beginner resources, it is one of the largest and most active amateur radio clubs focused on traditional hand-keying.
http://wd0hwt.net/
The Metro Area Repeater Association (MARA) operates the WD0HWT repeater system serving the Minneapolis/St. Paul, MN region on 146.25/.85 and 449.800/444.800 MHz. The site covers repeater rules of conduct, system description, history, emergency communications support, and membership contribution details for Twin Cities area amateur radio operators.
https://do1mj.de/
Marc, callsign DO1MJ, documents his amateur radio journey after earning his license in January 2022, with a strong focus on SOTA (Summits on the Air) activations across Germany, Slovenia, and beyond. Posts cover field equipment, Yaesu radio tips, mountain hikes combined with radio activations, and practical techniques for lightweight portable operating.
https://www.qsl.net/smarc
SMARC (Sparks Mountain Amateur Radio Club) is a 501(c)(3) nonprofit amateur radio club featuring meeting announcements, a club magazine called SMARC Sparks, and resources including a Hamfest schedule and Arduino class materials. The site serves as a hub for local ham radio enthusiasts with links to reference files, useful ham radio resources, and club news from the president's shack.
https://ciechanow.ski/moon
Bartosz Ciechanowski's deep-dive interactive article on the Moon covers everything from its orbital mechanics and phases to tides, eclipses, craters, and gravitational effects, all brought to life with stunning real-time 3D simulations and draggable visualizations. One of the most richly illustrated and technically impressive science explainers on the web, it invites readers to genuinely experience lunar concepts rather than just read about them.
https://contestcalendar.com/
Run by Bruce Horn (WA7BNM), this comprehensive calendar tracks amateur radio contests worldwide, offering 8-day, 5-week, 12-month, and perpetual views alongside rules summaries, log submission deadlines, and historical data going back to 2005. Hams can customize the calendar to display only their preferred contests and even subscribe to a weekly email digest, making it an essential reference for the contesting community.
https://wm7d.net/
Mark Downing (WM7D) runs this ham radio hub featuring a searchable callsign database, real-time solar flux reports, and dedicated resource pages for Yaesu radios including the FT2000, FT920, and FT100. Visitors will also find DX cluster links, QSO maps, TR Log for Linux, and a curated collection of amateur radio links.
http://rgbrown.org/
Robert G. Brown, a physicist at Duke University, shares an extensive collection of free online textbooks, physics study materials, poetry collections, philosophy essays, and beowulf cluster computing resources. The site is a sprawling intellectual hub covering everything from GPL software tools to metaphysics, all freely licensed under an open public license.
https://www.qsl.net/n1pce
John N1PCE runs the Northern New Hampshire AllStar Network, a linked repeater system spanning Whitefield and Groveton with VHF/UHF nodes and a DMR BrandMeister connection on Cannon Mountain. The site lists node frequencies, CTCSS tones, ASL node numbers, and a weekly 'North Country Weather Net' schedule for amateur radio operators in the north country region.
https://contesting.com/
Contesting Online is a hub for amateur radio operators passionate about radio sport and contesting, offering news, articles, contest schedules, mailing list archives, and product reviews. Part of the eHam.net network, it brings together a community of contesters with resources like the Contester Lookup, classified ads, and links to major contest logging software mailing lists.