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://hamradio.in/index.php
Hamradio.in is an Indian amateur radio community hub featuring technical projects, news, and event announcements for ham radio enthusiasts across India. Visitors can find hands-on build projects like DSB transceivers and DDS VFOs, coverage of events like Hamfest India and the Lamakaan Amateur Radio Convention, and discussions of digital modes like FT8.
https://n3wnb.tripod.com/
Tim Ingram (N3WNB) of Corry, PA built this ham radio page featuring a callsign lookup tool and a curated collection of links to resources like the ARRL, QRZ, and equipment suppliers. The site also highlights his Yaesu FT-847 rig and includes a local hams email list, giving it a personal community flavor alongside the standard reference links.
https://diptera.info/weblinks.php?cat_id=1
Diptera.info is a comprehensive portal dedicated to the insect order Diptera, covering flies, midges, and gnats with galleries, checklists, catalogues, and an active identification forum for researchers and enthusiasts worldwide. With over 5,000 members, a larva gallery, downloadable articles, and curated web links to scientific collections and catalogues, it serves as a serious reference hub for dipterists at all levels.
https://castfvg.it/galassie/indexgal.htm
An extensive galaxy catalog reference compiled by the Circolo Astrofili Talmassons (C.AS.T.), an Italian astronomy club, featuring member-photographed images organized across major catalogs including NGC, UGC, IC, PGC, Messier, and VCC. The site covers thousands of galaxies alongside deep sky objects, quasars, and galaxy clusters, making it a remarkable visual archive built collaboratively since 1996.
https://museum.state.il.us/exhibits/mazon_creek/about_mazon_creek.html
An educational exhibit from the Illinois State Museum exploring the famous Mazon Creek fossil deposits, dating back approximately 300 million years to the Pennsylvanian Period. Visitors can browse detailed pages on specific plant and animal fossils found in ironstone concretions, learn about the Francis Creek Shale formation, and explore why this site is considered one of the world's premier Lagerstätten.
https://dailydx.com/propagation
The Daily DX is a hub for ham radio operators focused on DXing, offering a curated propagation page with links to solar data, space weather forecasts, and VOACAP prediction tools. Visitors can track HF propagation conditions, solar activity, and greyline predictions to optimize their chances of reaching distant or weak-signal stations.
http://nhastro.com/
The New Hampshire Astronomical Society is a volunteer-run nonprofit dedicated to public astronomy education through skywatches, club meetings, and outreach to schools and libraries across New Hampshire. Visitors can find upcoming observing events, solar and lunar data, a telescope lending program, and resources for amateur astronomers throughout the region.
http://amasci.com/amateur/elehob.html
Bill Beaty's Electronics Hobbyist page is a sprawling directory of resources for electronics enthusiasts, covering surplus suppliers, schematics archives, robotics, embedded processors, Tesla coils, and electrostatics projects. It also includes Bill's own articles on electricity fundamentals, common misconceptions, and hands-on science experiments, making it a rich hub for both beginners and seasoned hobbyists.
https://amateurradio.com/
AmateurRadio.com is a long-running international hub for ham radio news, opinion, and technical discussion, celebrating over 29 years of service to the amateur radio community. Visitors will find podcast episodes, project write-ups on D-Star beacons and digital modes, equipment reviews, and community news covering topics from FT8 to MFJ Enterprises.
http://chaos.umd.edu/
The Chaos Group at the University of Maryland presents their research into chaotic dynamics, covering topics like fractal basin boundaries, chaotic scattering, strange attractors, and controlling chaos. Affiliated with multiple departments including Physics, Mathematics, and Electrical Engineering, this site offers a window into decades of groundbreaking nonlinear dynamics research dating back to the mid-1970s.