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://tgale.home.xs4all.nl/valves.html
Trevor Gale's comprehensive reference site covers vintage vacuum tubes and valves, offering pinout data, characteristics lists, military-to-commercial conversion tables, repair hints, substitution guides, and circuit diagrams for old receivers and amplifiers. Maintained as a companion to the rec.antiques.radio+phono newsgroup FAQ, it serves as a practical technical resource for both seasoned restorers and newcomers to valve/tube circuitry.
https://skip.cc/chase
Skip Talbot has documented over 458 storm chases since 2003, logging 288,186 miles and 156 tornado intercepts across more than two decades of pursuit. The site features yearly chase logs, a gallery, time-lapse videos, and detailed statistics that make it a fascinating firsthand record of storm chasing as a serious hobby.
https://qsl.net/scra
Stony Creek Amateur Radio (NC4FM) is a tax-exempt ham radio club based in Rocky Mount, North Carolina, founded in 2000 to mentor new operators, provide emergency communications, and participate in ARRL contests. The site covers repeater information, Field Day events, license testing, and local amateur radio organizations across the region.
https://hepdata.net/
HEPData is an open repository for publication-related High-Energy Physics data, hosting experimental datasets from major LHC collaborations including ATLAS, ALICE, CMS, and LHCb. Researchers can search and submit data using advanced query syntax, making it an essential reference tool for particle physics scientists worldwide.
https://qsl.net/we1fly
The Aeronautical Mobile Operators Club, callsign WE1FLY, is dedicated to ham radio operators who take their hobby airborne, earning the nickname 'Flyin' Hams.' The site provides resources on operating amateur radio in aircraft, including links to FAA regulations, QRZ.com profile info, and eQSL lookup for members.
https://hamqsl.com/
Paul Herrman (N0NBH) built this comprehensive resource for ham radio operators tracking HF propagation conditions, offering free solar-terrestrial data widgets, banners, and tools that can be embedded in any website. Visitors will find online calculators for SFI/SN conversion, K-Index to signal noise, Aurora latitude tools, MUF/LOF prediction maps, and live solar flux and sunspot data updated every few hours.
https://qsl.net/rz1ak/mail.html
The personal ham radio page of RZ1AK, a Russian amateur radio operator, featuring information on how to send letters and QSL cards to Russia. Hosted on the classic QSL.net network, this page offers a glimpse into the international correspondence culture of the ham radio community.
https://brandoweather.com/
Brandon Skalniak's labor-of-love severe weather reference site features a Radar Museum cataloging over 5,000 tornadoes, derechos, and tropical cyclones spanning from 1991 to the present. Visitors will find comprehensive tornado lists organized by intensity, mesocyclone couplet data, and a Hall of Fame for notable Mesoscale Convective Discussions dating back to 2003.
https://w5ks.org/
The Lawton Fort Sill Amateur Radio Club (W5KS) is a nonprofit ham radio club based in Lawton, Oklahoma, serving the community since 1949 with a focus on disaster preparedness, STEM education, and operator training. Visitors can find meeting schedules, upcoming net frequencies, free Morse code training sessions, and license testing events hosted by this ARRL-recognized club.
https://425dxn.org/
425 DX News is a long-running Italian weekly bulletin for serious DXers, founded in May 1991 and now past its 1800th issue, covering rare DX expeditions, contest calendars, and DX cluster updates. Produced by Mauro I1JQJ, Valeria IK1ADH, and a dedicated team of amateur radio operators, it serves the global ham radio community with bulletins, a searchable database, and a magazine.