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://electronics-notes.com/
Electronics Notes, created and maintained by engineer Ian Poole, is a comprehensive reference hub covering electronics theory, circuit design, components, radio technology, antennas, ham radio, and more. With tutorials aimed at everyone from hobbyists to professionals, it also offers downloadable guides, infographics, and component data sheets, making it a genuinely useful destination for anyone working with electronics.
https://nssl.noaa.gov/users/brooks/public_html/tornado
Harold Brooks of NOAA's National Severe Storms Laboratory presents a detailed statistical analysis of tornado climatology in the United States, examining frequency, death rates, and the challenges of detecting climate-related trends in the historical record. The site features data visualizations and Markov chain modeling of significant tornado days, with a particular focus on putting the large 1998 tornado death toll into historical perspective.
https://itis.gov/
ITIS is the official Integrated Taxonomic Information System, a partnership between U.S. federal agencies and global specialists providing authoritative scientific names and taxonomic classifications for plants, animals, fungi, and microbes worldwide. Researchers and biodiversity professionals can search by common name, scientific name, or TSN identifier, access hierarchical taxonomic reports, and download the full database for integration into their own projects.
http://uacnj.org/
The United Astronomy Clubs of New Jersey (UACNJ) operates multiple observatories at Jenny Jump State Forest and hosts regular public stargazing nights, meteor shower events, and astronomy programs for all ages. The site serves as a hub for member clubs, event scheduling, live sky cameras, newsletter archives, and donation drives for new observatory construction.
https://jessystems.com/
Pete Juliano, N6QW, shares decades of hands-on ham radio construction experience through detailed homebrew projects covering QRP and QRO SSB transceivers, linear amplifiers, and PIC microcontroller applications. A licensed ham since 1959 with multiple callsigns, Pete also documents restorations of classic rigs like the Heathkit HW-101 and Collins KWM2, plus publications in QRP Quarterly.
http://collembola.org/
A comprehensive scientific checklist of all Collembola (springtails) species in the world, searchable by taxon and linked to global distribution maps at family, genus, and species levels. The site also includes biology overviews, identification guides, collecting techniques, bibliographies, and images, making it an invaluable reference for entomologists and naturalists.
https://www.qsl.net/ps7ab
PS7AB is Rony's Brazilian amateur radio historical archive, dedicated to preserving the history of ham radio in the region. The page serves as a redirect to a Yahoo Geocities mirror, suggesting the main content lives at that now-defunct address.
https://home.adelphi.edu/~stemkoski/mathematrix/index.html
Mathematrix, created by Lee Stemkoski at Adelphi University, explores the playful and lesser-known side of mathematics through topics like polyominoes, Rubik's Cube, fractals, Conway's Game of Life, and higher dimensions. Accessible to curious minds at any level, the site blends mathematical art, humor, poetry, and hands-on puzzles to make recreational math genuinely entertaining.
https://n7uzg.tripod.com/
Mike Di Ross (N7UZG) runs this sprawling personal homepage covering his ham radio license renewal, travels across the US and abroad, run-ins with police, and miscellaneous life experiences. The site is a raw, unfiltered chronicle of one person's wandering life, with sections on cities he has lived in, engineering jobs, and even Perl cookie scripting.
https://bcbirdalert.blogspot.com/
BC Rare Bird Alert is a community birding blog tracking rare and unusual bird sightings across British Columbia, Canada, with detailed location reports, maps, and observer notes. Each post documents a specific rare species encounter, making it an invaluable real-time resource for birdwatchers and ornithology enthusiasts in the Pacific Northwest.