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://lavcastrogroup.org/planetariumshowsched.htm
The LAVC Astronomy Group's planetarium schedule page lists public show dates for Spring 2020, covering topics like the search for extraterrestrial life, black holes, and spring constellations. Each event is held at the campus observatory and includes telescope viewing through a Celestron 16-inch instrument after the show, making it a hands-on community astronomy experience.
http://k0bg.com/
K0BG is a comprehensive amateur radio resource run by Alan Applegate, focusing heavily on mobile ham radio installations, antenna theory, and RF bonding techniques. The site is packed with detailed technical articles, diagrams, and practical guidance that make it a go-to reference for hams interested in operating from vehicles.
https://zl2pd.com/index.html
Andrew Woodfield (ZL2PD) has built an extensive technical resource covering homebrew QRP transceivers, Si5351 VFO/BFO projects, antenna tuners, and DIY electronics for amateur radio operators. The site spans decades of original projects with detailed build guides, circuit diagrams, and modification instructions for portable HF SSB gear.
https://hfsignals.com/
HF Signals is the official home of the BITX line of amateur radio transceivers, offering a range of affordable QRP kits from the $39 all-analog LARCSet to the feature-packed $399 sBitx v3 SDR. Each radio is hand-assembled and tested, with open-source schematics and software, making them popular among homebrewers, beginners, and QRP enthusiasts worldwide.
https://www.qsl.net/dearg
The Driven Elements Amateur Radio Group (DEARG) is a Northeast Arkansas ham radio club operating under call sign KD5PXG, focused on 6 and 2 meter single sideband operation on 144.220 USB. The site serves as the club's web presence with sections for membership info, archives, and Sporadic E propagation news.
https://kasonline.org/astroweb.html
The Kalamazoo Astronomical Society's curated astronomy link directory groups hundreds of carefully selected web resources into subject categories, from amateur telescope making and astrophotography to planetary exploration and dark-sky parks. Organized like a yellow pages phone book, this extensive collection makes it easy for both beginners and seasoned stargazers to find the best astronomy sites on the web.
http://rainforest.gardenwebs.net/
Stern's Splendors of the Rain Forest is a richly illustrated site dedicated to tropical plants, focusing on orchids, bromeliads, tillandsias, cacti, and succulents native to the Americas. Featuring exotic photo galleries, cultural guides, and links to major plant societies worldwide, it serves as an enthusiast's showcase for rain forest horticulture.
https://www.qsl.net/w4frc
The Ft. McCoy Amateur Radio Club (W4FRC) is a friendly ham radio club based in the Ocala National Forest area of Marion County, Florida, founded in October 1997. The site shares club meeting info, VE testing schedules, member photos, and an open invitation for newcomers to discover the hobby of amateur radio.
https://www.qsl.net/dx1cw
The official web home of CW Philippines (Communications World of Amateurs Philippines Inc.), a ham radio club based in Manila that documents DXpeditions to Philippine islands including Batan, Marinduque, and Lubang. The site features expedition photo galleries, contest results, QSL information, membership resources, and articles about amateur radio culture and leadership in the Philippines.
https://www.qsl.net/yo8ps/links.html
YO8PS is the ham radio site of Sorin Parlog, a Romanian amateur radio operator whose links page compiles an extensive curated collection of ham radio resources including dealers, manufacturers, clubs, antenna resources, contesting groups, and callsign servers. The sheer breadth of categorized links makes this a useful reference point for hams looking to find suppliers, organizations, and special interest groups across North America and beyond.