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://antenna.it/
Giovannini Elettromeccanica is an Italian antenna manufacturing company specializing in HF antenna systems for both military and commercial applications, covering the RF spectrum from 1.5 to 30 MHz. Their product catalog includes log-periodic antennas, broadband wire dipoles, fiberglass masts, antenna rotators, and towers, with research, design, manufacturing, and support services all offered in-house.
https://www.qsl.net/wa4fob
WA4FOB has assembled an extensive categorized directory of ham radio links covering everything from national amateur radio societies worldwide to antenna manufacturers, DXing resources, QSL card printers, and license exam prep. With nearly 500 links organized into over 20 sections, this is a thorough reference point for amateur radio operators looking to connect with clubs, contests, logging software, and equipment dealers.
http://warac.org/
The West Allis Radio Amateur Club (W9FK) is a Wisconsin-based ham radio organization that sponsors the Wisconsin QSO Party and the David Knaus Memorial Scholarship. Visitors can find club news, event information, and resources for amateur radio enthusiasts in the greater Milwaukee area.
https://mysterium.com/extinction.html
Created by David Ulansey, this long-running reference site compiles hundreds of links to authoritative scientific reports documenting the ongoing sixth mass extinction and global biodiversity crisis. Active since 1998 and last updated in 2021, it covers species loss across vertebrates, insects, plants, and freshwater animals, drawing on sources like the IUCN, UN, WWF, and major scientific journals.
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://semarc.org/
SEMARC (South East Metro Amateur Radio Club) is a 501(c)(3) amateur radio club based in Cottage Grove, Minnesota, active since 1988 and affiliated with the ARRL. The site covers club meetings, volunteer examiner testing sessions, public service events, emergency communications, and membership information for ham radio enthusiasts in the Twin Cities metro area.
http://brastro.org/
The Baton Rouge Astronomical Society (BRAS) is a Louisiana-based astronomy club founded in 1981, bringing together roughly 95 amateur and experienced stargazers in the greater Baton Rouge area. Visitors can browse monthly observing guides, member astrophotos, a newsletter archive, dark sky advocacy efforts, and information on joining or attending events at the Highland Road Park Observatory.
http://polarimage.fi/
A Finnish sky photography site dedicated to atmospheric phenomena including aurora borealis and noctilucent clouds captured from the high latitudes of Finland. Visitors will find striking images of both day and night skies showcasing some of nature's most dramatic light displays.
https://mnwashcoares.org/
WCARES is the Washington County, Minnesota chapter of the Amateur Radio Emergency Service (ARES), coordinating licensed ham radio operators to support county emergency management during floods, severe weather, and mass sheltering events. The site outlines their mission, coverage priorities, and lists key leadership with callsigns, serving as a hub for emergency communication volunteers in the St. Croix River valley region.
http://ben.davies.net/telescope.htm
Ben Davies documents the design and construction of a 12.5-inch Newtonian telescope, covering everything from the equatorial horseshoe mount and mirror flotation cell to motorized collimation and CCD imaging. The site also includes observational work on variable stars, nebulae, galaxies, and spectroscopy, making it a rich resource for serious amateur telescope makers.