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.qsl.net/races
The national web presence for the Radio Amateur Civil Emergency Service (RACES), a program coordinating licensed amateur radio operators for emergency and disaster communications across the United States. Maintained by Ken Bourne (W6HK) since 1997, the site covers FCC RACES rules, news, volunteer protection information, and links to local RACES groups nationwide.
https://www.qsl.net/dl4tt/DawgX-rayClub.html
The Dawg X-ray Club is a satirical guide for amateur radio operators, humorously skewering the ego-driven behaviors of DXers who chase fame and prestige in the ham radio community. Created by Fritz Sommer (DL4TT), the site features chapters translated into multiple languages and links to classic DX operating resources, blending comedy with genuine community commentary.
http://talkorigins.org/
The TalkOrigins Archive is a comprehensive collection of articles, essays, and FAQs dedicated to presenting mainstream scientific responses to creationism, intelligent design, and evolution denial. Drawing from the long-running talk.origins Usenet newsgroup, it covers topics ranging from evolutionary biology and geology to abiogenesis, cosmology, and the age of the Earth.
http://g3pho.free-online.co.uk/microwaves
A hobbyist site dedicated to microwave frequencies above 1000MHz, inviting visitors to explore the upper reaches of the amateur radio spectrum. The site is part of the Amateur Radio World Ring webring, connecting enthusiasts focused on microwave and UHF/SHF band experimentation.
https://hfsignals.com/
HF Signals is the official home of the BITX line of amateur radio transceivers, offering a range of affordable QRP kits from the $39 all-analog LARCSet to the feature-packed $399 sBitx v3 SDR. Each radio is hand-assembled and tested, with open-source schematics and software, making them popular among homebrewers, beginners, and QRP enthusiasts worldwide.
https://w7dk.org/
The Radio Club of Tacoma (W7DK) is a nonprofit organization serving FCC-licensed ham radio operators in Pierce County, Washington and the South Puget Sound region. Members and visitors can find information on club meetings, repeaters, license exams, emergency communications, and the W7OS Antique Radio Museum.
https://w7aia.org/
The Clark County Amateur Radio Club (W7AIA) serves ham radio enthusiasts in Vancouver, Washington, offering resources on license testing, repeater information, emergency preparedness, and club activities. As an ARRL Special Service Club, they co-sponsor the annual SEA-PAC Ham Convention and provide training, nets, and events like Field Day and Parks On The Air.
https://vvara.org/
The Verde Valley Amateur Radio Association (VVARA) serves ham radio enthusiasts in North-Central Arizona, hosting regular club meetings, training presentations, and multiple weekly nets including trivia and rag chew sessions. The site also features a live weather station and camera feed from Mingus Mountain, making it a useful local hub for both radio operators and weather watchers.
https://1728.org/magntude.htm
A focused online calculator for computing astronomical magnitudes, covering apparent magnitude, absolute magnitude, and stellar luminosity with worked examples using real celestial objects like the Sun, Moon, and Sirius. The tool walks visitors through the underlying math of the magnitude scale, making it a handy reference for astronomy students and hobbyists alike.
http://lavajunkie.com/gallery.html
Lavajunkie.com is a passionate photography gallery dedicated to the volcanic activity of Kilauea, Hawaii, featuring extensive collections of lava flows entering the Pacific Ocean, surface flows, dawn shots, and even images purportedly showing the Hawaiian volcano goddess Pele. With over 20 gallery pages organized into themed collections, this site captures the raw spectacle of new earth being formed and invites armchair lava junkies to experience the phenomenon from their screens.