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://qsl.net/aa3rl/ant2.html
Mike Banz (AA3RL) breaks down the technical question of dipole antenna height with detailed radiation pattern analysis, helping amateur radio operators choose the right height for DX work, local nets, or directional operation. The page features multiple elevation pattern plots comparing dipole performance at various heights, making it a practical reference for hams planning their antenna installations.
http://jgiesen.de/welcomeEnglish.htm
A rich hobbyist resource by J. Giesen featuring an extensive collection of Java and JavaScript applets covering astronomy topics like sun and moon phases, planet positions, sundials, Venus transits, and satellite observation. Visitors will also find physics quizzes, chaos and fractal simulations, color theory tools, and links to books and software, making it a deep interactive playground for science enthusiasts.
https://astronomy-links.net/MarsColonies.html
Clark M. Thomas presents a critical essay arguing against the viability and ethics of Mars colonization, countering popular arguments with Malthusian population theory and opportunity cost reasoning. The piece challenges billionaire-backed space colony fantasies by urging focus on Earth's existing ecological and humanitarian crises instead.
http://ukesca.org/
The UK ESCA Users Group is a professional forum connecting scientists from academia and industry around Electron Spectroscopy for Chemical Analysis and surface science, meeting twice yearly and publishing an online newsletter. The site offers an extensive guide to surface science techniques and acronyms, tutorials, online databases of binding energies and elemental properties, and a global directory of surface science laboratories.
http://amurbirding.blogspot.com/
The Amur Bird Project documents bird research and conservation efforts in Russia's Amur region and Siberia, with detailed field reports on catching, tagging, and tracking species like Bluethroats with geolocators. Run by a team of researchers including Wieland Heim and collaborators, it offers a rare window into ornithological fieldwork in some of the world's most remote wetland habitats.
https://www.qsl.net/ai4hb
The Fort Knox Amateur Radio Club (FKARC) serves ham radio enthusiasts in the Fort Knox, Kentucky area, with a focus on DX operations, ARES emergency communications, and VE licensing exams. Visitors will find club meeting schedules, repeater information, constitution and bylaws, J-pole antenna plans, and a broad collection of ham radio links.
https://www.qsl.net/i6ypk
I6YPK's workshop page showcases homebrew HF transceiver projects built in collaboration with I6WJB, including double and triple conversion designs covering 0-30 MHz continuous coverage. The site also features HP spectrum analyzer and frequency standard resources, making it a valuable technical reference for radio electronics builders.
http://math.ucdavis.edu/~calculus
Calculus.org is a comprehensive educational hub hosted by UC Davis, offering step-by-step calculus problems, Java applets, Maple and Mathematica animations, and sample exams for both students and instructors. The site covers differential, integral, and multivariable calculus with resources ranging from humorous beginner guides to actuarial review problems, making it a well-rounded reference for anyone tackling the subject.
http://insti.physics.sunysb.edu/physics/physics_links.htm
Maintained by Stony Brook University's physics department, this extensive link directory covers physics preprints, online journals, conferences, jobs, data sources, and institutions. Researchers and students will find hundreds of curated links spanning Physical Review, arXiv, SLAC SPIRES, astrophysics journals, and community resources like Fermilab and the Nobel Foundation.
https://gadgeteer.us/
Bill Meara's Gadgeteer site is a celebration of electronic homebrewing, centered on ham radio projects including DSB and SSB rigs, tube receivers, and QRP builds alongside a popular podcast called SolderSmoke. The site also ventures into amateur astronomy, model rocketry, and kite aerial photography, making it a rich destination for technically adventurous hobbyists.