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://www.andrews.edu/~burton/mathlinks/coolmathlinks.htm
A curated collection of mathematics education links compiled at Andrews University, organized into sections for teachers, parents, and students across K-12 grade levels. The directory covers lesson plans, interactive activities, problem-solving resources, and NCTM-aligned curriculum materials from across the early web.
https://spacew.com/
Solar Terrestrial Dispatch is a 36-year-old space weather service offering near real-time auroral activity mosaics, solar wind data, X-ray flux readings, and experimental flare prediction heatmaps updated every two minutes. Visitors can track geomagnetic conditions, monitor the electrical power grid demand, and view stunning satellite imagery of aurora activity over both hemispheres.
https://hc2ae.tripod.com/
HC2AE is a Spanish-language ham radio hub created by an amateur radio operator in Guayaquil, Ecuador, serving as a meeting point for Latin American radioaficionados. The site features a Guayaquil callbook searchable by callsign or name, DX information, contest listings, propagation resources, software links, and a chat and forum for the ham radio community.
https://arca-az.org/
The Arizona Repeater Council of Arizona (ARCA) appears to be an organization coordinating amateur radio repeater operations across the state of Arizona. The site uses frames-based navigation, suggesting an older web presence dedicated to ham radio coordination and regional repeater management.
http://trx-manager.com/
TRX-Manager, created by Laurent F6DEX, is a CAT control, DXing, and logging software package supporting nearly 150 transceivers including models from Yaesu, Kenwood, Icom, and Elecraft. Though distribution has been discontinued, the site still provides updates for registered users and bilingual support in both English and French.
https://scottaaronson.blog/
Shtetl-Optimized is the long-running blog of Scott Aaronson, a theoretical computer scientist and quantum computing researcher, where he dives deep into complexity theory, quantum computing misconceptions, AI, and education policy. Known for its intellectual rigor and wit, it attracts readers from academia and beyond who enjoy substantive takes on math, physics, and the occasional culture-war skirmish in gifted education.
https://www.qsl.net/k/kb7tbt//links
KB7TBT's ham radio links page is a well-organized curated directory of amateur radio resources spanning personal ham pages, local and national clubs, ATV groups, email forums, repeater councils, and commercial outlets. Created in 1998 and maintained through 2013, it serves as a comprehensive jumping-off point for hams interested in Arizona-area radio activity as well as broader national amateur radio communities.
https://w1cdn.net/
W1CDN documents ham radio adventures with hands-on technical posts covering packet radio, homebrew builds, APRS digipeaters, and radio orienteering projects. The site features detailed notes on software configurations like direwolf and flrig, DIY hardware builds including a powered speaker and homebrew power meter, and practical guides for operating on various bands.
http://rocklandastronomy.com/
The Rockland Astronomy Club (RAC) is one of the East Coast's premier nonprofit astronomy education organizations, hosting star parties, lectures, dark sky observing sessions, and the renowned Northeast Astronomy Forum (NEAF). Visitors can find event schedules, observing locations at New York state parks, and information about joining a vibrant community of amateur astronomers.
https://brandoweather.com/
Brandon Skalniak's labor-of-love severe weather reference site features a Radar Museum cataloging over 5,000 tornadoes, derechos, and tropical cyclones spanning from 1991 to the present. Visitors will find comprehensive tornado lists organized by intensity, mesocyclone couplet data, and a Hall of Fame for notable Mesoscale Convective Discussions dating back to 2003.