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://donklipstein.com/
Don Klipstein's sprawling technical resource covers everything from LEDs and fluorescent lamps to Tesla coils, xenon strobes, lasers, and high voltage experiments. With decades of accumulated hobbyist knowledge, detailed guides, and regularly updated content, it's an indispensable reference for electronics enthusiasts interested in lighting and discharge lamp technology.
https://www.qsl.net/vk3te/Packet.html
Peter Brennan (VK3TE) runs this page dedicated to his packet radio BBS operations in Victoria, Australia, where he serves as sysop for multiple nodes including VK3TE and VK3SPB, connecting to an extensive international packet network. The site details his RF feeds to Melbourne-area BBS stations, AXIP/AXUDP partnerships spanning Australia, New Zealand, Europe, and North America, and offers telnet access for users wanting to join the network.
https://joshworth.com/dev/pixelspace/pixelspace_solarsystem.html
Created by Josh Worth, this site presents a scale model of the solar system where the Moon is reduced to a single pixel, requiring visitors to scroll endlessly through vast empty space to appreciate the true distances between planets. The experience is both humbling and educational, with witty commentary along the way and the ability to toggle between kilometers, miles, AU, and other quirky units of measurement.
http://bsa13.com/jota
BSA13's Jamboree on the Air page documents Pack, Troop, and Crew 13's participation in JOTA, the annual worldwide event where Scouts communicate with each other via ham radio. Operating under callsign KE9JQ on 20 meters, BSA13 has contacted Scouts in over 25 countries using both voice and Morse code over 28 years of participation.
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://nightskylive.net/sd
NightSkyLive appears to be a live sky or astronomy viewing resource, likely offering real-time or streaming views of the night sky. The domain and subdirectory suggest a science-focused project aimed at stargazers and astronomy enthusiasts.
http://marsradio.net/MARSmain
The Metropolitan Amateur Repeater System is the official site for a Los Angeles-area ham radio repeater network founded in 1993, operating on 447.820 MHz and linked 24/7 to a Missouri repeater via EchoLink. Beyond repeater info, the site offers local earthquake reports, weather, and traffic resources for Southern California ham operators.
https://astronomynotes.com/
Nick Strobel's Astronomy Notes is a comprehensive, free educational resource covering introductory astronomy topics from the scientific method and history of astronomy to planetary science, relativity, and telescopes. Originally created for college-level astronomy courses, the site has been widely copied across the web and is also available as a purchasable hardcopy book through Kendall Hunt.
https://fishesofaustralia.net.au/
Fishes of Australia is a comprehensive reference database hosted by Museums Victoria on behalf of the OzFishNet community, covering the diversity and biology of Australia's marine and freshwater fish species. Visitors can explore an interactive Lucid Key for identifying freshwater fishes, a picture-based Family Finder, and detailed species profiles like the rare Whiskered Prowfish.
https://kc1xx.com/
KC1XX is the site for a competitive amateur radio station, featuring details about the station setup, antenna systems, and the team behind the operation. Visitors can browse the station gallery, search logs, and request QSL cards, with a bonus section covering the HJ4XX DX expedition.