HowStuffWorks: Weapons (Popularity: )

Articles on a variety of weapons.
Category: Science\Technology\Military Science\Weapons

Web Mineral (Popularity: )

Extensive mineral database containing crystallography, chemical composition, physical and optical properties, Dana classification, Strunz classification, ...
Category: Science\Earth Sciences\Geology\Rocks and Minerals

How Space Exploration Will Work (Popularity: )

Illustrated narrative shows a number of advanced space concepts.
Category: Science\Technology\Mechanical Engineering\Propulsion