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://physics.weber.edu/carroll/Wonder/extinctions.htm
A focused educational page from Weber State University exploring the history of mass extinctions, covering all five major extinction events across 600 million years of Earth's history. Complete with graphs, fossil imagery, and detailed descriptions of each extinction's causes and casualties, it makes paleontological science accessible and visually engaging.
http://aimspice.com/
AimSpice appears to be a SPICE circuit simulation software site, offering tools for electronic circuit analysis and modeling. The minimalist page redirects visitors to the main document, suggesting a focused software or technical resource for electronics engineers and hobbyists.
https://hflink.com/
HFLINK is the international hub for ALE (Automatic Link Establishment) high-frequency ham radio communications, covering HF interoperability, selective calling (SELCALL), and emergency communications. Visitors can find ALE frequencies, band guides, software resources, propagation data, and archives from HF interoperability exercises dating back years.
https://dk7ih.de/2022/05/new-post-a-walkie-talkie-ssb-transceiver-for-14mhz-or-the-higher-rf-bands
DK7IH is the personal engineering site of Peter Rachow, a radio amateur who documents his homebrew SSB transceiver builds including QRP multiband rigs, walkie-talkie style transceivers, and SMD-based designs for the 14MHz band and beyond. The site is a detailed technical resource for ham radio enthusiasts interested in hands-on RF circuit construction and design.
https://sephonicus.neocities.org/
Sephonicus has built a personal homepage dominated by science-themed imagery, with repeated 'SCIENCE!!!' alt texts suggesting an enthusiastic celebration of scientific topics. The site is sparse in text but leans heavily into a science identity through its visuals and branding.
http://forrestmims.org/
Forrest M. Mims III is a prolific science author and self-taught scientist whose personal site documents decades of atmospheric research including UV-B measurements, volcanic aerosol tracking, and twilight photometry at Mauna Loa Observatory. With over 7.5 million books sold and a Rolex Award for science, Mims shares original scientific data, publications, and photography spanning solar radiation, dust layers, and environmental monitoring.
http://rainreport.com/
RainReport.com offers a way to track and measure rainfall data without needing on-site monitoring equipment or physically visiting your property. The service uses Doppler radar and related data to provide precise rainfall reports, making it a practical tool for homeowners, farmers, and anyone who needs to know when and how much rain fell at a specific location.
https://go-astronomy.com/astro-club-search.htm
GO ASTRONOMY hosts a comprehensive directory of over 600 amateur astronomy clubs across all 50 U.S. states, plus international listings spanning countries from Japan to Germany. Visitors can search by state to find local clubs offering meetings, star parties, viewing nights, and stargazing programs, making it an essential starting point for anyone wanting to connect with fellow astronomers.
https://www.qsl.net/kc4gzx/kc4gzx/index.htm
KC4GZX is a ham radio enthusiast's site packed with homebrew DIY projects covering antennas, amplifiers, filters, transmitters, receivers, and test equipment. It also serves as a regional resource for Northeast Georgia amateur radio operators, featuring ham directories, repeater listings for multiple southeastern states, and hamfest schedules.
https://www.qsl.net/la5ki/org.htm
LA5KI hosts an extensive photo archive of vintage ham radio equipment, organized by manufacturer and spanning dozens of classic brands like Collins, Hallicrafters, Heathkit, and Hammarlund. With over 60 images catalogued across rare and iconic mid-century radio manufacturers, this site is a visual treasure trove for vintage radio collectors and enthusiasts.