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)
http://csgnetwork.com/hamfreqtable.html
CSGNetwork's Amateur Radio Frequency Table is a comprehensive reference listing all US ham radio band allocations, including mode restrictions, calling frequencies, and licensing class privileges across bands from 160 meters to microwave. Part of a larger calculator and reference site, it also links out to related frequency tables for CB, FRS, marine VHF, cellular, and cordless phone bands.
http://users.rcn.com/rmacedo
Robert Macedo's homepage covers emergency communications in Eastern Massachusetts, with a focus on ARES, RACES, and SKYWARN activities including severe weather activation reports dating back to 1997. The site documents real storm events like nor'easters, tropical storms, and severe weather outbreaks alongside training drills, NWS Taunton SKYWARN program info, and links to ham radio and weather resources nationwide.
https://ipac.caltech.edu/2mass/gallery/index.html
The 2MASS Atlas Image Gallery at IPAC (California Institute of Technology) showcases stunning false-color infrared composite images from the Two Micron All Sky Survey, covering everything from solar system objects and nebulae to galaxies and star clusters. Compiled from three infrared wavelength bands mapped to visible colors, this publicly released collection serves as both a scientific resource and a visually compelling window into the infrared universe.
https://sky-chaser.com/
Christopher Collura's Sky-Chaser site chronicles his adventures as a SKYWARN storm spotter and hurricane chaser, with tropical weather tracking, storm documentation, and real-time links to NHC and JTWC data. Beyond extreme weather journalism, the site covers his many pursuits including skydiving, HAM radio, photography, computer programming, and aerobatics.
https://qsl.net/sandra/APRS_primer.html
A focused primer on APRS (Automatic Position Reporting System) for the San Diego area, explaining how the technology uses GPS and two-meter radio to track vehicles, search and rescue teams, ships, and aircraft. Hosted on QSL.net and maintained by the San Diego Repeater Association, the page collects key links for getting started with APRS including software downloads, station locators, and local elmers.
http://mathres.kevius.com/art.html
Bruno Kevius has assembled an extensive link collection covering mathematical art, fractals, chaos theory, and geometry, featuring resources on M.C. Escher, polyhedra, cellular automata, and fractal software. With over 120 curated links spanning strange attractors, tessellations, origami, and geometric sculpture, this is a rich reference hub for anyone exploring the intersection of math and visual art.
https://qsl.net/gi4fum
David Hutchinson's personal homepage from County Antrim, Northern Ireland, featuring his amateur radio callsign GI4FUM and participation in the Amateur Radio World Ring webring. The site also touches on Antrim District Scouts, archery sports injury resources, and related links, making it a snapshot of a multifaceted Northern Irish hobbyist's online presence.
https://trlog.com/
TR LOG is the official home page for a high-performance ham radio contest logging program created by Larry 'Tree' Tyree (N6TR), a member of the CQ Contest Hall of Fame and 2003 Hamvention Amateur of the Year. Visitors can download a free trial, browse features like true two-radio support and a unique name database, and access the manual, CW interfaces, and revision history.
http://ncrg.org.au/
The Northern Corridor Radio Group (NCRG) is an amateur radio club based in Whiteman Park, Perth, Western Australia, operating callsigns VK6ANC, VK6NC, and VK6NE across contests and regular on-air activity. The site covers club meetings, licensing courses, exams, repeater status, construction projects, and events like the annual Hamfest and carboot sale.
https://nzart.org.nz/nzart
The New Zealand Association of Radio Transmitters (NZART) is the national membership organization for amateur radio operators in New Zealand, offering licensing guidance, study resources, exam information, and emergency communications coordination through its AREC volunteer network. With over a century of history leading up to its 2026 centenary, the site includes band plans, repeater maps, branch directories, and the association's long-running publication Break-In.