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://uvminerals.org/minerals/gallery
The Fluorescent Mineral Society hosts a stunning photo gallery showcasing minerals from around the world photographed under shortwave, midwave, and longwave ultraviolet light, revealing their glowing colors. Specimens from famous localities like the Franklin and Sterling Hill mines in New Jersey, Tsumeb in Namibia, and sites across China, Australia, and Brazil are featured with photographer credits and mineral identification.
http://kc7nod.20m.com/index.htm
CW's radio page is a hobbyist resource dedicated to shortwave listening, featuring DIY projects and guides for devices like random wire antennas, static discharge units, ferrite couplers, and attenuators. The site offers practical technical content for SWL enthusiasts, including modification guides for receivers like the DX 390 and transformer builds.
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.
http://icstars.com/HTML/SolarSection/HAlpha/OBSERVINGTHESUNHAlpha1.html
David Knisely's comprehensive H-Alpha handbook covers solar observation in remarkable technical depth, with dedicated sections on prominences, sunspot group classification, solar flares, and a full glossary of H-Alpha terminology. Part of the larger ICSTARS Astronomy site, this resource is a serious reference for amateur astronomers interested in observing the sun through hydrogen-alpha solar filters.
http://aerith.net/index.html
Seiichi Yoshida's comprehensive comet resource site offers extensive catalogs, weekly bright comet updates, light curves, and thousands of photographs tracking comets from around the world. Yoshida is a notable amateur astronomer who even had a minor planet named after him, and his MISAO project leverages global imagery to detect and track remarkable astronomical objects.
https://assa.org.au/
The Astronomical Society of South Australia (ASSA) is an active community organization offering public and member viewing nights, monthly meetings, and astronomy resources for all skill levels. The site features a rich collection of guides covering astrophotography, comets, variable stars, Aboriginal astronomy, and solar system events, plus details on observing sites like Stockport Observatory.
http://learningastronomy.com/
LearningAstronomy.com appears to be an educational resource focused on astronomy, though the page content is extremely sparse with only a single image loaded. The domain name strongly suggests a site aimed at introducing beginners to astronomy concepts and space science.
http://redcircuits.com/
RED Free Circuit Designs is a hobbyist electronics resource offering dozens of free audio amplifier schematics, preamplifier modules, headphone amplifiers, and miscellaneous electronic circuit designs. Visitors can browse Class-A and Class-B amplifier projects, phono preamps, intercom circuits, and many more practical designs, all available at no cost.
http://ppcook.blogspot.com/
P.P. Cook is a theoretical physics lecturer who writes infrequent but thoughtful posts exploring topics like quantum mechanics, string theory, Dynkin diagrams, and the philosophy of simulation. The blog blends rigorous mathematical content with accessible commentary, touching on books, art inspired by physics, and the day-to-day perspective of an academic on a finite contract.
https://wildflowers-and-weeds.com/
Thomas J. Elpel's plant identification hub teaches visitors to recognize wildflowers, weeds, and edible plants by learning the patterns of plant families rather than memorizing individual species. The site complements his book 'Botany in a Day' and includes slideshows, weed ecology, foraging guides, mushroom information, and online classes.