Science & Nature
1413 sites
Subcategories:
- Astronomy & Space (390)
- Chemistry (7)
- Earth Sciences (24)
- Biology (76)
- Physics (29)
- Mathematics (51)
- Weather & Climate (100)
- Amateur Radio (681)
- Electronics (45)
https://lcra.org.co/
The Liga Colombiana de Radioaficionados (LCRA) is Colombia's national amateur radio organization, founded in 1933 and serving as a member society of the IARU. The site covers licensing procedures, reciprocal license applications, frequency bands, club history, diplomas, and official resolutions for Colombian ham radio operators.
https://pcars.org/wp
The Platinum Coast Amateur Radio Society (PCARS, callsign W4MLB) is a Florida non-profit club serving amateur radio operators in central and southern Brevard County for over 60 years. The site covers club membership, monthly meetings, the Melbourne Hamfest, VE licensing exams, ARRL Field Day, emergency nets, local repeaters, and mentorship resources for hams at every experience level.
http://math2.org/
Math2.org is a comprehensive math reference site offering organized tables, formulas, and identities covering everything from basic arithmetic to calculus, linear algebra, and Fourier transforms. Available in both English and Spanish, it also features a message board for math questions and links to other top math resources on the web.
http://written-sins.org/space
The Final Frontier is a fanlisting dedicated to the wonder of outer space, collecting fans from around the world who share a passion for the cosmos. With 77 members from 25 countries and a stunning Hubble image of galaxy NGC 660 as its backdrop, it captures the community spirit of space enthusiasm in classic fanlisting style.
http://wxqa.com/
The Citizen Weather Observer Program (CWOP) is a public-private partnership that collects weather data from over 7,000 citizen-operated stations across North America, feeding real-time observations to NOAA and dozens of government agencies. Visitors can join the network, check data quality, view maps and displays, and access resources for setting up their own personal weather stations.
https://n3vem.com/blog
N3VEM is Vance Martin's ham radio blog covering repeater projects, AREDN mesh networking, antenna builds, and special event stations like the CQ Salk activation. The site documents ongoing technical projects including the Radio Rocket and r4e repeater builds, with posts spanning portable operations, field day, and POTA activities.
https://qsl.net/jh3ybs/index_e.html
The JH3YBS Hyogo Scout Council Amateur Radio Club represents the official radio station of the Boy Scouts Hyogo Council in Japan, supporting amateur radio activities within scouting. The site outlines club activities including JOTA (Jamboree on the Air), TDOTA, overseas jamborees, contests, and equipment details, making it a valuable hub for scout radio enthusiasts.
https://solarpower.guide/
Bob Robertson's hobby site is a sprawling reference on solar power, covering everything from basic definitions and how solar panels work to educational guides for kids and van-life solar setups. With dozens of articles on renewable energy topics, it reads like a one-man encyclopedia built by a retiree passionate about the subject.
http://www2.rdrop.com/users/billmc
Bill McFadden's eclectic homepage covers a surprisingly deep range of radio-related interests, from pirate radio station KHOG and FCC licensing FAQs to scanner frequencies, shortwave charts, and wireless microphone regulations. Alongside the radio content, visitors will find loudspeaker design resources, audio editing scripts for Cool Edit Pro, and home automation links, making it a genuine hobbyist's workbench online.
https://astronomyonline.org/
Built by a legally blind photographer and astronomer, Astronomy Online is a comprehensive resource covering topics from astrophotography and the solar system to cosmology, astrobiology, and exoplanets. The site includes observation guides, a worksheet library for teachers, software recommendations, and an image gallery, making it a remarkable contribution from someone who created it despite a significant physical disability.