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://audible.transient.net/archive
The Music Electronics µArchive is a long-running reference hub for DIY guitar effects and audio electronics, offering schematics archives, FAQs, and curated links to the best resources on the web. Highlights include a downloadable schematics archive, guides on tube amplifiers and transistor identification, and an Electro-Harmonix parts sheet for builders working with vintage pedal components.
https://ccarc.org.au/
The Central Coast Amateur Radio Club (CCARC) is a community of amateur radio operators and electronics enthusiasts based in Kariong, New South Wales, Australia. The site offers information on repeaters, education for aspiring licensed operators, club news, event calendars, and emergency communications support resources.
http://w1mx.mit.edu/
The MIT Radio Society (W1MX) is America's oldest college amateur radio station, a student-run club at MIT focused on RF engineering, telecommunications, and radio science. The site covers membership info, meeting schedules, club history, ham exam resources, balloon programs, and a capital campaign to build a new station.
https://www.qsl.net/e2
Electronic Communications 2000 (E-2) is an amateur radio club founded by Jason Foster, now a member of the Foundation for Amateur Radio, with divisions covering topics like radio broadcasting. The site includes club officers, member listings, and news about the club's activities, including a column in the FAR publication AutoCall.
http://cbat.eps.harvard.edu/index.html
The Central Bureau for Astronomical Telegrams (CBAT), hosted at Harvard University since 1966, is the official IAU clearinghouse for announcing new astronomical discoveries including comets, novae, supernovae, and other transient celestial events. Visitors can browse online IAU Circulars, subscribe to discovery feeds, explore lists of supernovae and comets, and learn how to submit their own astronomical observations.
https://www.qsl.net/g4prs
The Poole Radio Society (G4PRS) is a UK-based amateur radio club representing enthusiasts in the Poole area, hosted on the QSL.net network. The site serves as the club's online presence, likely featuring member information, club activities, and resources for local ham radio operators.
http://ve7sl.blogspot.com/2026/02/recent-630m-fun.html
Steve (VE7SL) runs this amateur radio blog chronicling his homebrewing projects and on-air adventures spanning frequencies from 2200m to nanowaves. Posts dive deep into technical topics like 630m band operations, antenna construction, and propagation experiments, making it a fascinating read for hams interested in the MF/LF frontier.
https://www.qsl.net/f1fla
The personal ham radio page of F1FLA, Jouffroy Jean-Jacques, a French amateur radio operator based in Lessard le National. The site focuses on amateur radio topics including EME (Earth-Moon-Earth) communication and antennas, hosted on the well-known QSL.net amateur radio platform.
https://www.mathsisfun.com/links/external.html
A curated collection of external math links from MathIsFun, organized into math websites, fun puzzle sites, and schools, covering everything from algebra and geometry to game theory and Pi. Created by Rod Pierce, this page serves as a springboard to some of the web's best math resources for students, teachers, and curious minds alike.
http://williamson-labs.com/
Williamson Labs is a comprehensive electronics tutorial site covering foundational topics like transistors, op-amps, 555 timers, and circuit design for learners at various levels. It serves as a structured educational reference for anyone looking to understand basic and intermediate electronics concepts through instructional content.