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://benholcomb.com/storm-chasing/links
Ben Holcomb's storm chasing hub features an extensive links directory connecting visitors to fellow storm chasers, meteorology resources, and severe weather organizations. With over 400 storm chasing posts logged and sections covering tornado videos, pictures, past chase statistics, and equipment, this is a serious enthusiast's personal record of years spent pursuing severe weather.
https://asteroid.lowell.edu/
Lowell Observatory's Asteroid Observing Tools hub provides professional-grade data mining and observation planning tools for minor planets and comets, powered by the astorbDB database. Researchers and amateur astronomers alike can query orbital parameters, generate ephemerides, identify near-Earth asteroids, and download datasets using interactive tools like AstEph, AstFinder, and QueryBuilder.
http://foxtango.org/foxtango001.htm
Fox Tango International is a long-running Yaesu users group established in 1972, dedicated to owners and enthusiasts of Yaesu radio equipment. The site hosts technical manuals, modification pages, classified ads, and historical looks at vintage Yaesu transceivers from the 1960s through today.
https://dvaa.org/
The Delaware Valley Amateur Astronomers (DVAA) is a club serving astronomy enthusiasts in the Philadelphia region, offering star parties, loaner equipment, observing site guides, and an expert Q&A forum for beginners and seasoned stargazers alike. The site features astrophotography resources, member image galleries, outreach event coverage, and a newsletter, making it a rich hub for amateur astronomy in the area.
https://qsl.net/wa5mc
The Atchafalaya Amateur DX Association Inc. (AADXA) is a ham radio club based in Amelia, Louisiana, with a full organizational presence including officer listings, membership applications, meeting minutes, newsletters, and repeater information. Developed by Guy R. Morrison (WA5MC), the site also features field day photos, a guestbook, and club constitution documents, making it a solid hub for local amateur radio enthusiasts.
https://background.uchicago.edu/~whu
Wayne Hu is a Professor of Astronomy and Astrophysics at the University of Chicago, and this site serves as his academic hub covering cosmology research including CMB polarization, baryon acoustic oscillations, cosmic shear, and large-scale structure. Visitors will find an impressive collection of tutorials, lecture notes, research codes, publications, and course materials spanning decades of work in theoretical cosmology.
http://icarc.org/
The Iowa City Amateur Radio Club (ICARC) serves ham radio enthusiasts in the Iowa City and Coralville area, offering resources on local repeaters, HF nets, fox hunts, and emergency operations. Visitors can find Field Day information, a Hall of Fame, WSPR presentations, and links to callsign lookups and real-time solar-terrestrial data.
https://www.qsl.net/races
The national web presence for the Radio Amateur Civil Emergency Service (RACES), a program coordinating licensed amateur radio operators for emergency and disaster communications across the United States. Maintained by Ken Bourne (W6HK) since 1997, the site covers FCC RACES rules, news, volunteer protection information, and links to local RACES groups nationwide.
http://meteorite-identification.com/
Meteorite-identification.com helps enthusiasts and beginners distinguish genuine meteorites from 'meteor-wrongs,' offering identification tests, case studies of misidentified specimens, and commentary on media coverage of meteorite claims. The site also covers meteorite collecting as a hobby, with guidance on buying specimens and evaluating suspect auction listings on eBay.
https://h14s.p5r.org/2012/09/0x5f3759df.html
Christian Plesner Hansen's technical blog dives deep into the legendary fast inverse square root hack and its magic constant 0x5f3759df, tracing the algorithm's surprising history from Ardent Computer in the 1980s through SGI, 3dfx, and Quake III Arena. The post rigorously explains the underlying floating-point bit manipulation, generalizes the technique to arbitrary powers, and includes graphs and mathematical derivations that illuminate why this 'evil' hack actually works.