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://m1hax.uk/
Richard M1HAX documents his Summits on the Air (SOTA) activations across Britain and beyond, combining amateur radio operating with serious hiking and mountaineering in places like Wales, Scotland, and Malta. The site features detailed activation reports, technical guides like building a LoRa APRS tracker for off-grid position tracking, and a log of radio contacts made from mountain summits.
https://jars.net/
The Johnston Amateur Radio Society (JARS) is a North Carolina-based ham radio club founded in 1975, serving members in the Johnston County area with a dedicated repeater on the AK4H frequency at 147.270 MHz. The site offers membership info, event listings, newsletters, a 'How to Become a HAM' guide, VE team details, and club history spanning over 40 years of amateur radio fellowship.
https://qrp-labs.com/2-uncategorised/44-qrp-labs-shop.html
QRP Labs is a shop and resource hub for amateur radio enthusiasts, offering a wide range of kits including CW transceivers, digital transceivers, GPS receivers, WSPR/QRSS transmitters, and high-altitude balloon trackers. The site features an impressive catalog of homebrew-style radio kits catering to QRP (low power) operators, with supporting documentation, newsletters, and community resources.
https://mostlydiyrf.com/
Mostly DIY RF is a specialized resource for amateur radio builders, offering PCB kits and detailed documentation for RF circuits including IF amplifiers, low-pass filters, VFOs, crystal filters, and MMIC amplifiers. The site covers designs by well-known ham radio engineers like Hayward and Kopski, making high-performance transceiver building accessible to hobbyists.
https://rars.org/
The Raleigh Amateur Radio Society (RARS) is an active ham radio club based in Raleigh, North Carolina, offering membership meetings, public service events, license classes, and the annual RARSfest hamfest. The site serves as a hub for local hams with announcements covering field days, emergency communications, portable operating events, and resources for newcomers through its Ham Tracks program.
https://www.qsl.net/cpra
The official web presence of the C.P.R.A. (Confraternidad Puerto Rico Amateur), a Puerto Rican amateur radio organization led by President Miguel Lopez (WP4HDH), offering news, member resources, and links to FCC and ARRL. The site includes proclamations for Amateur Radio Day, net schedules, membership applications, and licensing exam information for Puerto Rico.
https://autostakkert.com/
AutoStakkert! is free lucky imaging software created by Emil Kraaikamp for automatically analyzing, aligning, and stacking planetary and solar images captured through a telescope via high-speed video. The site offers downloads of multiple software versions (AS!2 through AS!4), sample images of Jupiter, Mars, and the Moon, and guides demonstrating how the stacking algorithm dramatically sharpens noisy astrophotography footage.
https://morseresource.com/
MorseResource, created by AI4QR, offers tools and resources for learning and improving Morse code skills, including code generators, daily quote MP3 files, and Morse code podcasts. The podcast idea was born from a desire to practice copying code anywhere, making this a practical and inventive hub for amateur radio enthusiasts.
http://calendarzone.com/
The Calendar Zone, created by Janice McLean, is a comprehensive categorized directory of calendar-related links covering art, celestial, cultural, religious, historical, and reform topics. With over 7 million visitors since 1999, it serves as a one-stop hub for anyone curious about calendar systems, moon phases, lunar cycles, and the history of timekeeping across cultures.
Extinctions
NEW!
https://physics.weber.edu/carroll/Wonder/extinctions.htm
A focused educational page from Weber State University exploring the history of mass extinctions, covering all five major extinction events across 600 million years of Earth's history. Complete with graphs, fossil imagery, and detailed descriptions of each extinction's causes and casualties, it makes paleontological science accessible and visually engaging.