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://k3lr.com/
K3LR is the homepage of Tim Duffy's world-class amateur radio contest station, featuring a multi-operator, multi-transmitter setup that has been featured in QST, RadCom, and the Spectrum Monitor. The site showcases Team K3LR's competition activities, sponsored equipment from Icom and DX Engineering, and links to Dayton Contest University events.
https://bacteria.icu/
Stanislaus runs this enthusiastically nerdy site dedicated to prokaryotes and bacteria, complete with a gallery, wiki, and guestbook hosted on Neocities. The playful 'Bacteria Intensive Care Unit' theme and self-described obsession with microbiology make it a charming corner of the web for fellow microbe enthusiasts.
https://qsl.net/n1otx
Paul's N1OTX homepage is a weather-obsessed amateur radio operator's corner of the web, featuring a real-time home weather station for Brockton, MA, Java-based weather casts, and wind chill calculators comparing old and new NWS formulas. Beyond the weather tools, the site also dives into packet radio with a local BROCK node, and offers curated links for amateur radio clubs, ARES/RACES, and general computing resources.
https://hermetic.ch/cal_stud/jdn.htm
Peter Meyer's detailed reference article explains the Julian Day Number system, covering its origins, astronomical vs. chronological uses, and various related date formats like Modified Julian Day Numbers and Lilian Day Numbers. The page includes conversion algorithms and links to calendar software tools, making it a thorough technical reference for astronomers, historians, and calendricists.
https://tube.be/
A specialized reference guide cataloging the vacuum tube types used in shortwave radio broadcast transmitters, organized alphabetically and numerically for easy lookup. The site also lists manufacturers, rebuilders, and distributors worldwide, including companies like Thales, Eimac, Penta Laboratories, and Xuguang, making it a practical industry directory for broadcast engineers.
http://bsa13.com/jota
BSA13's Jamboree on the Air page documents Pack, Troop, and Crew 13's participation in JOTA, the annual worldwide event where Scouts communicate with each other via ham radio. Operating under callsign KE9JQ on 20 meters, BSA13 has contacted Scouts in over 25 countries using both voice and Morse code over 28 years of participation.
https://mathgenealogy.org/
The Mathematics Genealogy Project is a massive academic database tracking the doctoral advisor lineages of mathematicians worldwide, with over 337,000 records linking students to their advisors across generations. Hosted by NDSU in association with the American Mathematical Society, it lets you trace the intellectual ancestry of virtually any mathematician back through history.
http://theastronomer.org/index.html
The Astronomer is a long-running UK amateur astronomy magazine with a history dating back to 1964, featuring meteor shower guides, supernova lightcurves, and annual meeting records. Compiled largely by Tracie Heywood, the site offers a complete magazine index, historical awards archives, and observational data useful for both visual and radio observers.
https://math.columbia.edu/~woit/wordpress?p=15620
Peter Woit's 'Not Even Wrong' is a long-running physics blog hosted at Columbia University, covering cutting-edge topics in theoretical physics including twistor theory, quantum field theory, and the mathematics of unification. Woit writes with deep technical expertise and a critical perspective, making this a destination for mathematically sophisticated readers interested in the foundations of modern physics.
http://pictures.ed-morana.com/
Ed Morana's personal astronomy photo and video archive documents rare celestial events including total solar eclipses, Venus and Mercury transits, ISS transits, asteroid occultations, and the Northern Lights. The collection spans events from 2006 through 2024, with time-lapse composites and an Android app for ISS transit prediction making it a genuinely useful resource for amateur astronomers.