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://casswww.ucsd.edu/archive/public/tutorial/History.html
Gene Smith of UC San Diego's Center for Astrophysics and Space Sciences presents a detailed tutorial on the history of astronomy, tracing human observation of the skies from Stonehenge and ancient agrarian cultures through Pythagoras, Aristotle, Aristarchus, Copernicus, Kepler, and Galileo. Rich with links to related topics like archaeoastronomy, eclipse prediction, and the Music of the Spheres, this page is part of a broader astronomy education series hosted by UCSD.
https://helicoprion.neocities.org/
A shrine dedicated to Helicoprion, the ancient spiral-toothed shark whose bizarre whorl jaw has fascinated paleontologists for decades. The site includes speculative audio of how the creature might have sounded and even a campaign to vote Helicoprion into the fighting game SkullGirls, showing real enthusiasm for this prehistoric oddity.
https://faraday.physics.utoronto.ca/GeneralInterest/Harrison/Flash
Created by a University of Toronto physicist, this collection features 99 Flash animations covering topics from Quantum Mechanics and Relativity to Chaos and Fluid Mechanics, making abstract physics concepts visually intuitive. A bonus tutorial teaches how to build your own physics animations in Flash, and the animations are available in multiple languages under a Creative Commons license.
http://ka6wke.blogspot.com/
Mark Schoonover (KA6WKE) shares his amateur radio experiences, including homebrew antenna tuner builds, HF mobile setups, and equipment reviews for his IC-7000 and IC-706MKIIg rigs. The site features hands-on technical posts about Z-match tuners, horizontal loops, and ladder line feeding, making it a useful read for hams interested in practical antenna projects.
DX.QSL.NET
NEW!
https://dx.qsl.net/
DX.QSL.NET is a dedicated hub for amateur radio DXing enthusiasts, offering a powerful log search engine to browse DX logs from around the world. Visitors can access dynamic propagation reports, Tropo Ducting information, and real-time DX spots via a chat interface, making it a practical toolkit for active DXers.
http://james.ahlstrom.name/pcr1000
James Ahlstrom shares his Python-based control software for the Icom PCR-1000 wideband radio receiver, covering the full 100 kHz to 1.3 GHz tuning range. The page includes setup instructions for Windows and Linux, download links for dependencies like pyserial and pywin32, and a practical explanation of how PC-controlled radio software works.
http://mndmr.net/
MNDMR.net is the home of Minnesota's first in-house DMR repeater CBRIDGE network, providing information about connected repeaters, talkgroups, and codeplugs for digital radio users in the region. The site serves the local amateur radio community with resources for the MNSTATE and MNTAC talkgroups on the Brandmeister network.
http://twisterdata.com/
TwisterData.com is a meteorological data tool built in 2008 by storm chasers David Demko and Donald Giuliano, offering RAP, NAM, and GFS weather model forecasts with detailed atmospheric parameters like CAPE, hodographs, helicity, and sounding data. Designed with a clean, data-first philosophy, it pulls from NOAA datasets and is especially valuable for storm chasers, meteorologists, and serious weather enthusiasts who need raw model output without distractions.
https://qsl.net/qarg
The Quincy Area Repeater Group (QARG) was a club of licensed amateur radio operators in West Central Illinois who established and maintained the 147.195MHz 2M repeater serving the Quincy, Illinois and North Eastern Missouri area. The site serves as a historical record of the group's 18-year operation before transferring control to the Western Illinois Amateur Radio Club, including a full list of charter members and their callsigns.
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.