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://mushroomexpert.com/
MushroomExpert.Com, maintained by Michael Kuo, is a comprehensive reference covering over 1,300 mushroom species with detailed entries, identification keys, and photographs for each genus and species. It stands out as one of the most thorough free mycology databases on the web, covering everything from common yard fungi to rare and obscure species across North America.
http://jgiesen.de/astro/english.htm
Created by J. Giesen, this rich astronomy resource features interactive Java applets for computing solar and lunar positions, planetary visibility, eclipses, sunrise/sunset tables, and much more. Standout features include a top-rated GeoAstro Applet Collection, detailed coverage of the Venus transits and Mars oppositions, and tutorials on astrophysics topics like stellar formation and the Saros cycle.
https://gsbarc.org/
The Great South Bay Amateur Radio Club (GSBARC) has served the Babylon, NY area on Long Island for over 55 years, coordinating public service events, emergency communications through ARES/RACES, and licensing education. Visitors can find club newsletters, repeater information, net schedules, upcoming contest dates, and special event certificates all in one place.
https://whiskeytangohotel.com/
WhiskeyTangoHotel.Com is a hobbyist electronics and amateur radio blog featuring hands-on projects like ESP32 microcontroller builds, temperature logging with Node-RED, and Morse code analysis tools. The site blends practical hardware tutorials with radio operator interests, making it a great find for tinkerers who enjoy cheap microcontrollers and DIY data visualization.
https://themineralgallery.com/
The Mineral Gallery is a comprehensive online reference dedicated to minerals, featuring detailed descriptions, chemical formulas, physical properties, and photographs of hundreds of mineral specimens. It serves as an invaluable resource for collectors, geology students, and enthusiasts seeking in-depth information on everything from common quartz varieties to rare sulfosalts.
https://qsl.net/we1fly
The Aeronautical Mobile Operators Club, callsign WE1FLY, is dedicated to ham radio operators who take their hobby airborne, earning the nickname 'Flyin' Hams.' The site provides resources on operating amateur radio in aircraft, including links to FAA regulations, QRZ.com profile info, and eQSL lookup for members.
https://qsl.net/aa3rl/ant2.html
Mike Banz (AA3RL) breaks down the technical question of dipole antenna height with detailed radiation pattern analysis, helping amateur radio operators choose the right height for DX work, local nets, or directional operation. The page features multiple elevation pattern plots comparing dipole performance at various heights, making it a practical reference for hams planning their antenna installations.
https://mcrca.org/
The Monroe County Radio Communications Association (MCRCA) is a Michigan ham radio club founded in 1941, making it one of the oldest amateur radio organizations in the state and Michigan's first ARRL Special Service Club. The site introduces the club's mission of helping newcomers obtain FCC amateur radio licenses and connects visitors to related local organizations like the River Raisin Repeater Association.
https://www.qsl.net/n1pce
John N1PCE runs the Northern New Hampshire AllStar Network, a linked repeater system spanning Whitefield and Groveton with VHF/UHF nodes and a DMR BrandMeister connection on Cannon Mountain. The site lists node frequencies, CTCSS tones, ASL node numbers, and a weekly 'North Country Weather Net' schedule for amateur radio operators in the north country region.
https://mineralienatlas.de/
Mineralienatlas is a comprehensive German-language encyclopedia and community platform covering mineralogy, geology, paleontology, and mining, supported by thousands of members worldwide. Visitors can search minerals by chemical properties, browse fossil and mineral portraits, explore collecting locations, and dive into crystallography and systematic mineralogy.