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://britastro.org/useful-links
The British Astronomical Association, supporting amateur astronomers since 1890, maintains this curated directory of useful links covering UK astronomy societies, observing resources, and related organizations. Visitors will find connections to groups like the Society for Popular Astronomy, the Federation of Astronomical Societies, and many more resources spanning the full breadth of amateur astronomy.
https://faraday.physics.utoronto.ca/GeneralInterest/Harrison/Flash
Created by a University of Toronto physicist, this collection features 99 Flash animations covering topics from Quantum Mechanics and Relativity to Chaos and Fluid Mechanics, making abstract physics concepts visually intuitive. A bonus tutorial teaches how to build your own physics animations in Flash, and the animations are available in multiple languages under a Creative Commons license.
http://sss-mag.com/smith.html
A comprehensive reference hub dedicated to the Smith Chart, the classic RF engineering tool invented by Phillip Smith of RCA, covering tutorials, software downloads, example charts, reference books, and curated links to related tools and pages. Visitors can explore the mathematical foundations of impedance matching, s-parameters, and microwave design through a well-organized collection of articles, Java applets, and PDF resources.
http://ibiblio.org/modena/hamradio.html
Steve Modena (AB4EL) built this focused ham radio link archive hosted on ibiblio, collecting mailing list digests, USENET archives, and FAQs across specialized topics like QRP, boatanchors, Collins radios, glowbugs, Heathkit, homebrew, and the 160-meter topband. A handy centralized gateway for vintage and low-power radio enthusiasts looking to dig into discussion archives and community resources from the late 1990s and early 2000s.
http://twiar.org/
This Week in Amateur Radio (TWIAR) is a long-running news service delivering up-to-the-minute ham radio news via amateur repeaters, HF, shortwave, LPFM, and podcasting. Produced by Community Video Associates, Inc., it covers the latest developments in amateur radio technology, DX, satellites, and more, supported by listener donations.
http://cogweb.ucla.edu/CogSci/ToMM.html
A scholarly resource from UCLA's CogWeb project exploring Theory of Mind (ToMM), the cognitive mechanisms humans use to attribute mental states like beliefs, desires, and intentions to others. Written by Francis F. Steen in 1997, it covers the groundbreaking work of Alan Leslie and Simon Baron-Cohen on autism, child development, and the evolutionary origins of mind-reading abilities.
https://www.qsl.net/n1irz
Dave Finley (N1IRZ) shares his deep expertise in amateur radio through articles on Morse Code training, radio history, and radio astronomy, including information about his published book 'Morse Code: Breaking the Barrier.' The site covers an impressive range of topics from the Koch Method of CW training to QRP radio kits, six meters, and the history of ham radio in Socorro, New Mexico.
https://www.qsl.net/wb4kdi
Dave J. Barnes, callsign WB4KDI, maintains this amateur radio site covering radio equipment notes, operating notes, digital modes, and DX beacons. It also includes band condition monitoring tools and an online resources index, making it a handy reference for fellow ham radio enthusiasts.
https://www.qsl.net/w4rmt
The Castalia Island DX Association is a ham radio club based in Rocky Mount, North Carolina, dedicated to promoting DXpeditions, HF operation, and working DXCC entities under ARRL program rules. Membership is free and open to anyone interested in DX activity, making it a welcoming hub for amateur radio operators in eastern North Carolina.
https://astronomyedinburgh.org/
The Astronomical Society of Edinburgh has been sharing a love of astronomy since 1924, hosting hybrid in-person and online meetings, observing group sessions, and public talks several times a month. Visitors can explore sky diaries, knowledge articles, beginner observing lists, meteor camera data, and a Messier/Caldwell project archive alongside a live interactive solar system map.