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://kyham.info/
KYHAM.INFO serves as the central hub for Kentucky amateur radio operators, providing emergency net frequencies, section emergency plans, hamfest listings, and Skywarn severe weather resources. Maintained by Dan Rubino KD9CHL, this resource connects Kentucky hams with local district information, traffic manager reports, and the KYHAM groups.io community.
https://michaelbach.de/ot/index.html
Michael Bach's massive collection of 154 optical illusions and visual phenomena combines interactive experiments with scientific explanations grounded in vision research and perceptual psychology. Each illusion is presented with thoughtful commentary on how the brain's visual shortcuts create misleading interpretations, making this an exceptional resource for anyone curious about how human perception actually works.
http://icarc.org/
The Iowa City Amateur Radio Club (ICARC) serves ham radio enthusiasts in the Iowa City and Coralville area, offering resources on local repeaters, HF nets, fox hunts, and emergency operations. Visitors can find Field Day information, a Hall of Fame, WSPR presentations, and links to callsign lookups and real-time solar-terrestrial data.
https://ptable.com/
Ptable is a richly interactive periodic table created by Michael Dayah, offering property trend visualization, 3D orbital diagrams, isotope data, and compound mixing tools for all 118 elements. Available in dozens of languages and regularly updated, it serves as a go-to reference for students, educators, and chemistry enthusiasts alike.
http://n0hr.com/
N0HR.com is a hub for amateur radio operators, offering PocketPC ham radio software including MobileLog 2 for contact logging, PPCMorse for learning Morse code, and PocketDigi for digital modes like PSK31 and RTTY. The site also features a large curated and user-rated ham radio links directory, HF propagation tools, a DXPedition map, and a blog covering tower projects, contests, and DX activity.
http://citynight.com/atv
The personal amateur radio station page of WA6ZJG, operated from Alameda, California in the San Francisco Bay Area, with a focus on Amateur Television (ATV) operations. Visitors can find station information, ATV repeater live video captures from W6CX, announcements, and ham-related links.
https://starastronomy.org/
STAR (Society of Telescopy, Astronomy, and Radio) is a Monmouth County, NJ amateur astronomy club founded in 1957, offering monthly meetings, star parties, observing nights, and public outreach programs for all experience levels. The site features sections on telescope making, light pollution, a spectrogram tool, member photos, and a picture of the day, making it a rich hub for local stargazers.
http://cycloneroad.com/
Cyclone Road is the personal homepage of storm chaser Amos Magliocco, featuring chase reports, photos, a chase blog, and gear recommendations. The site includes a tribute to Eric Nguyen and links to essential storm chasing reading on safety, ethics, and tornado pursuit.
https://aprs.org/
The original home of APRS (Automatic Packet Reporting System), a ham radio digital communications protocol developed by Bob Bruninga (WB4APR) that allows operators to share real-time position, weather, messages, and event data over a single national channel. Now maintained for historical purposes, the site archives over two decades of APRS development including presentations, technical guides, satellite projects, and links to balloon launches and digipeater resources.
http://mineralzine.chez.com/
Mineral Webzine is a bilingual French-English non-commercial online magazine dedicated to rockhounds, mineral collectors, and geology enthusiasts. Featuring photographs of specimens like garnet, wulfenite, and cinnabar contributed by collectors from Canada and France, it serves as a reference for mineralogy, crystallography, and gemology.