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://cryptocoryne-lagenandra-galerie.de/
A German-language gallery dedicated to Cryptocoryne and Lagenandra aquatic plants, featuring photographs and information about these popular aquarium plant genera and their hybrids. Enthusiasts of tropical water plants will find this a specialized visual reference for identifying and appreciating these fascinating species.
https://journal.jcampbell.ca/
Jim Campbell (VE1KM) keeps this personal journal documenting his amateur radio adventures, including Parks on the Air activations, balun testing, 3D-printed ham radio accessories, and Morse Code operating tracked via the Reverse Beacon Network. Live feeds of his recent QRZ contacts, POTA stats, and Mastodon posts make this a genuinely active ham radio log worth bookmarking.
https://qsl.net/rmnarc
The Rocky Mountain Navy Amateur Radio Club (K0USN) is a military-themed ham radio club founded in 1999 to honor active duty, retired, and separated Navy personnel while promoting amateur radio operation and technical training. The site lists club officers with their callsigns and military ranks, and links to pages covering upcoming events, members in action, and contest victories.
https://cometchasing.skyhound.com/
Comet Chasing, maintained by Skyhound, provides monthly up-to-date observing guides for telescopic comets visible this month, complete with finder charts, observing synopses, and brightness predictions tailored to your latitude and equipment. It covers current comets like Kreutz sungrazers and PANSTARRS discoveries, making it an invaluable tool for amateur astronomers who want to hunt comets visually or through imaging.
http://wa1mba.org/
Tom WA1MBA has built a comprehensive resource dedicated to microwave amateur radio, covering everything from 10GHz rainscatter propagation to millimeter wave band projects, waveguide design, and LNA and quadrupler hardware builds. Active since 1996, the site features technical papers, conference presentations, RF connector guides, and a mailing list reflector for fellow microwave ham enthusiasts.
https://mathgenealogy.org/
The Mathematics Genealogy Project is a massive academic database tracking the doctoral advisor lineages of mathematicians worldwide, with over 337,000 records linking students to their advisors across generations. Hosted by NDSU in association with the American Mathematical Society, it lets you trace the intellectual ancestry of virtually any mathematician back through history.
https://botanical.com/botanical/mgmh/mgmh.html
A hypertext edition of Mrs. M. Grieve's landmark 1931 reference work 'A Modern Herbal,' covering medicinal, culinary, cosmetic, and economic properties of over 800 herbs and plants. The site includes alphabetical plant indexes, a recipes index, a poisons index, and supplementary reference tools like conversion tables and a medical dictionary.
https://qsl.net/ke6wuk
A QSL.net-hosted personal page for amateur radio operator KE6WUK, part of the popular free web hosting service dedicated to ham radio enthusiasts. The directory index is essentially empty or inaccessible, offering no visible content beyond a bare file listing.
http://w7zoi.net/
The personal site of Wes Hayward (W7ZOI), a well-known amateur radio engineer and co-author of 'Experimental Methods in RF Design' (EMRFD), featuring technical articles, filter design resources, errata, and glimpses of his ham shack. A rich destination for radio homebrewers and RF enthusiasts, with bonus content covering mountain hikes that incorporated amateur radio operation.
https://r-clarke.org.uk/
A comprehensive amateur astronomy resource covering the monthly night sky, planetary facts, eclipse details, Messier objects, telescope guides, and an astro dictionary for beginners. The site also extends into amateur radio with club listings, beginner guides, and rally information with GPS postcodes.