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://ucolick.org/~sla/leapsecs/deltat.html
Steve Allen's detailed reference site on the history and technical implications of leap seconds, delta time, and precision time scales used in astronomy and timekeeping. It features plots, tables, historical data, and analysis of the ongoing ITU-R debate over whether to abandon leap seconds from UTC.
https://mysterium.com/extinction.html
Created by David Ulansey, this long-running reference site compiles hundreds of links to authoritative scientific reports documenting the ongoing sixth mass extinction and global biodiversity crisis. Active since 1998 and last updated in 2021, it covers species loss across vertebrates, insects, plants, and freshwater animals, drawing on sources like the IUCN, UN, WWF, and major scientific journals.
https://dominiccook.xyz/
Dominic Cook's personal site collects his explorations in mathematics, number theory, measure theory, and speculative metaphysics alongside creative web projects like 88x31 webpins, glitch art, and calculators. The mix of rigorous mathematical writing and old-web aesthetics makes it a quirky, intellectually curious corner of the indie web.
https://www.qsl.net/farg
The Friends of Amateur Radio Group (FARG), operating under callsign N9LCR, is a Chicago-area amateur radio club promoting radio knowledge, fraternalism, and community outreach through multiple digital and Allstar nets. The site connects members and visitors to club nets like the Net with No Name, Teapots Tech-Friday Net, and Kidz Connection Net, and features event coverage from Field Day and the Yuma Hamfest.
https://avastronomyclub.org/
The Antelope Valley Astronomy Club (AVAC) is a nonprofit organization founded in 1982 to share the wonders of the night sky with families in northeastern Los Angeles County. Members range from beginners to advanced observers, and the club offers monthly meetings, school presentations, observing programs, and resources like telescope guides and DSO observing lists.
https://k3ltc.com/
Nate Berry's personal amateur radio page serves as a virtual QSL card for callsign K3LTC, a General class operator based in New York's FN30mu grid square. The site details his involvement with the Suffolk County Radio Club, activity on 2 meter and 70 centimeter bands, and even features an image transmitted via SSTV.
http://atoptics.co.uk/
Atmospheric Optics (atoptics.co.uk) is a comprehensive reference site dedicated to the science of light phenomena in Earth's atmosphere, covering rainbows, halos, glories, coronas, mirages, green flashes, and much more. With an optical phenomenon of the day (OPOD) feature, a blog, and detailed explanations of how sunlight interacts with atmospheric particles, it is an essential resource for anyone curious about the colorful mysteries of the sky.
https://umbra.nascom.nasa.gov/eclipse/980226/text/filter-sources.html
Part of NASA Reference Publication 1383, this page provides a curated list of U.S. vendors selling mylar and glass solar filters safe for eclipse and solar viewing with or without a telescope. It includes contact details for well-known optics companies like Celestron, Meade, and Orion, making it a practical companion resource for amateur astronomers preparing for solar observation.
https://front.emilkirkegaard.dk/
Emil O. W. Kirkegaard is a quantitatively minded researcher whose personal site serves as a hub for his extensive academic publications covering psychometrics, intelligence research, behavioral genetics, and population studies. The site lists dozens of peer-reviewed papers published in journals like Comparative Sociology and OpenPsych, alongside links to his English and Danish blogs and YouTube channel.
https://qsl.net/sandra/APRS_primer.html
A focused primer on APRS (Automatic Position Reporting System) for the San Diego area, explaining how the technology uses GPS and two-meter radio to track vehicles, search and rescue teams, ships, and aircraft. Hosted on QSL.net and maintained by the San Diego Repeater Association, the page collects key links for getting started with APRS including software downloads, station locators, and local elmers.