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/k6eag
The Hayward Radio Club (K6EAG) is a non-profit amateur radio club serving the San Francisco Bay Area's East Bay community, offering member meetings, emergency preparedness drills, licensing upgrade classes, and access to 2M, 6M, and 70CM repeaters. Incorporated in California as an educational foundation, it provides a hub for ham radio enthusiasts in the Hayward region.
https://erowid.org/plants/kratom
Erowid's comprehensive vault on Kratom (Mitragyna speciosa) covers botanical classification, effects, dosage, chemistry, health risks, legal status, and media coverage of this Southeast Asian plant. The site aggregates scientific research, first-person experience reports, news articles, and regulatory updates from the FDA and DEA, making it a thorough reference for anyone researching this psychoactive plant.
https://www.qsl.net/na4sh
The Nash County ARES (Amateur Radio Emergency Service) is a volunteer group serving Nash County and Rocky Mount, North Carolina by providing emergency communications during disasters like hurricanes, floods, and tornadoes. The site covers their weekly nets on local repeaters, links to weather resources, and connections to state and national ARES organizations.
https://aaroncake.net/circuits/index.asp
Aaron Cake's extensive collection of electronic circuit schematics covers categories from power supplies and light/laser projects to telephone circuits and sound/radio designs. Each circuit includes printable PCB patterns, community rankings, and user comments, making it a hands-on resource for hobbyist electronics builders.
https://www.qsl.net/sparc
The Hamilton County Amateur Radio Club serves the Adirondack Mountains region of New York, coordinating repeaters, emergency communications nets, and ARES/RACES operations across Hamilton and neighboring counties. Visitors will find meeting schedules, repeater frequencies, event listings like Field Day and the Southern Adirondack Hamfest, and resources for anyone interested in getting a ham radio license.
https://dxmaps.com/spots/mapg.php?Lan=E
DXMAPS is a real-time interactive mapping tool for amateur radio operators, displaying live QSO contacts and SWL spots across multiple bands and propagation modes worldwide. Visitors can filter by frequency band, propagation type (Sporadic-E, Aurora, EME, Tropo, F2, and more), region, and data source including DX-Cluster and PSK Reporter, making it an invaluable tool for DXers and ham radio enthusiasts.
https://mistal2.tripod.com/CAS
The Cumberland Astronomical Society is an amateur astronomy club based in Gallatin, Tennessee, dedicated to bringing astronomy to the general public. The club hosts monthly events at local schools, libraries, and parks, though this Tripod page now redirects visitors to their updated website at CumberlandAstronomicalSociety.org.
http://scdxc.org/
The Southern California DX Club (SCDXC) is a 77-year-old amateur radio organization focused on DX (long-distance) contacts, bringing together ham radio enthusiasts across the Southern California region. The site hosts membership info, newsletters, a digital library of amateur radio materials, and links to key resources like the ARRL, NCDXF, and QSL bureau services.
https://www.astronomy.org/
Gary A. Becker's astronomy hub at Moravian University offers original astrophotography, weekly starwatch articles, and curated links to astronomy, weather, and science resources. Highlights include stunning lunar eclipse photos and decades of accumulated observational content dating back to 1996.
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.