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://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.
https://www.qsl.net/iz7ath/web/02_brew/brew_eng.htm
IZ7ATH's homebrew section is a treasure trove of DIY amateur radio projects covering antennas, RF devices, shack accessories, and test instruments. Visitors will find detailed build guides for cubical quads, delta loops, linear amplifiers, baluns, antenna rotators, and beginner soldering tutorials all in one place.
https://spacearchive.info/
Space Archive, maintained by Brian Webb since 2000, is a comprehensive regional resource covering space and astronomy for the American Southwest, with a particular focus on Vandenberg Space Force Base rocket and missile launches including schedules, viewing guides, launch history, and multimedia. The site also features astrophotography tips, suburban astronomy guides, dark sky sites, and over two decades of archived space and astronomy news.
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://awkwardbotany.com/
Awkward Botany is an amateur botany blog written for the "phytocurious," covering plant families, weed profiles, horticulture, urban ecology, and plant identification with genuine depth and enthusiasm. Posts like the detailed breakdown of Liatris microcephala and the Weeds of Boise series showcase careful research and a love of plant science that will delight both beginners and seasoned plant nerds.
https://moonconnection.com/
MoonConnection.com is a comprehensive lunar reference covering moon phases, eclipses, Apollo missions, tides, and the moon's gravitational effects, complete with interactive tools and a monthly phases calendar. It also offers practical guides on fishing, hunting, and night photography by moon phase, plus companion mobile apps for tracking lunar cycles on the go.
https://www.qsl.net/lcarc
The Logan County Amateur Radio Club (LCARC) serves ham radio enthusiasts in Logan, West Virginia, about 60 miles south of Charleston. The site provides information on club repeaters, meeting details, membership applications, and archives for this reviving local radio club.
https://atmos.uw.edu/marka/ca.normals.html
Hosted on the University of Washington's atmospheric sciences domain, this page presents California's observed climate normals for the 1971-2000 period, including mean monthly precipitation and daily maximum and minimum temperatures. Visitors can click on map markers to explore station-level climate data across the state, making it a handy reference for researchers, students, and weather enthusiasts.
https://rrra.org/
Red River Radio Amateurs (RRRA) is the official website for an amateur radio club serving the Red River region, featuring club news, event calendars, repeater information, and resources for aspiring ham radio operators. The site covers POTA activations, net schedules, license testing, ARES meetings, and an active blog with technical posts from club members.
https://arpgalaxy.com/
A comprehensive amateur astronomy resource dedicated to Halton C. Arp's Atlas of Peculiar Galaxies, cataloging all 338 peculiar and interacting galaxy entries with supporting data, imagery, and observing guidance. Built by and for amateur observers, the site bridges professional archival photography from the Palomar 200-inch telescope with modern amateur CCD imaging to show that anyone with a backyard telescope can observe these remarkable objects.