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://ibiblio.org/virtualcell/tour/cell/cell.htm
The Virtual Cell is an interactive educational tour of a biological cell, using extensive imagery to guide visitors through cellular structures and components. The included pronunciation guide and visual-heavy layout suggest this is a reference resource designed to help students and curious learners explore cell biology in an engaging, self-guided format.
http://smallwonderqrp.blogspot.com/2019/04/fiero-compact-qrp-ssbcw-transceiver.html
K.P.S. Kang's blog dedicated to QRP (low power) radio transceiver design, featuring detailed technical write-ups on homebrew SSB/CW transceivers like the FIREO, which uses an innovative FM limiter circuit for speech compression. A must-read for ham radio enthusiasts interested in minimalist radio construction and RF engineering theory.
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://www.qsl.net/barc
The Bristol Amateur Radio Club (BARC) serves ham radio enthusiasts in the Bristol, TN/VA area, with information about their local FM and C4FM repeaters, monthly meetings, newsletters, and contesting activities. A long-running club site hosted on QSL.NET, it connects members and visitors to resources for advancing amateur radio knowledge and community involvement.
https://workbench.libsyn.com/hrwb-258-morse-code-bug-emulator-with-don-wb9cyy-and-bob-wo6w
Ham Radio Workbench is a podcast and blog dedicated to the maker and experimenter side of amateur radio, covering topics from PCB design and microcontrollers to vintage keys and SDR. This episode features Don WB9CYY and Bob WO6W discussing their ingenious Morse code bug emulator that gives modern paddles the organic, imperfect feel of classic mechanical telegraph keys.
https://atmos.uw.edu/marka/or.normals.html
Hosted by the University of Washington's atmospheric sciences department, this page presents Oregon's monthly climate normals for the 1971-2000 period, including mean precipitation, maximum temperature, and minimum temperature data by location. Visitors can click on map markers to explore station-level climate statistics across the state, making it a handy reference for weather researchers and outdoor planners alike.
http://thehellhole.com/
A detailed German-language educational site covering black holes and singularities, exploring topics from stellar and supermassive black holes to Hawking radiation, mathematical models, and even the theoretical dangers of black holes at CERN. The site draws a fascinating parallel between modern astrophysics and Norse mythology's concept of the Maelstrom, making complex science accessible through storytelling.
https://dxmaps.com/spots/mapg.php?Lan=E
DXMAPS is a real-time interactive mapping tool for amateur radio operators, displaying live QSO contacts and SWL spots across multiple bands and propagation modes worldwide. Visitors can filter by frequency band, propagation type (Sporadic-E, Aurora, EME, Tropo, F2, and more), region, and data source including DX-Cluster and PSK Reporter, making it an invaluable tool for DXers and ham radio enthusiasts.
https://www.qsl.net/iz7ath/web/02_brew/brew_eng.htm
IZ7ATH's homebrew section is a treasure trove of DIY amateur radio projects covering antennas, RF devices, shack accessories, and test instruments. Visitors will find detailed build guides for cubical quads, delta loops, linear amplifiers, baluns, antenna rotators, and beginner soldering tutorials all in one place.
https://www.saao.ac.za/~wpk/astron.html
A comprehensive curated directory of astronomy links collected from mailing lists like ASTRO and HASTRO-L, covering everything from beginner stargazing tips to telescope making, satellite tracking, and the history of ancient calendars. Hosted on the South African Astronomical Observatory domain, this resource spans hundreds of links organized into detailed categories for amateur and serious astronomers alike.