PatrickJMT (Just Math Tutorials): The administrator of this site (a college-level math instructor with nearly a decade of experience) provides an extensive collection of instructional videos for thousands of basic mathematical operations.
The offerings include nearly 400 guides for algebra, 275 for calculus, and just over 150 for trigonometry.
Most videos range between 6 and 10 minutes, providing a clear explanation of the subject at hand.
A search tool allows users to find videos pertaining to specific operations or functions.
Science World: The guides on this site are divided into five categories: Physics, Chemistry, Astronomy, Mathematics, and Biography. Each was created by researchers from Wolfram using Mathematica software, and are available to users free-of-charge.
Many guides feature .GIF images, 3D animation, and other high-resolution media resources.
A large portion of the articles are user-generated; contributors upload content, and site administrators edit the submissions for accuracy and readability.
Famous figures in the sciences are searchable by name, nationality, historical period, and/or prizes won during their lifetime.
Science.gov: This bare-bones site features links to more than 200 contemporary science topics. The list is alphabetized, and each entry will redirect users to all federal agencies and organizations associated with that particular field.
The site curates information from more than 55 databases, 2,100 websites, and 200 million individual pages.
The Science.gov homepage also features a news bulletin, video clips, and other science-oriented resources.
Eformulae.com: This site is a collection of scientific and mathematical formulas used in fields like engineering, physics, chemistry, and statistics. The layout is fairly rudimentary, but the materials are easy to access and the information is reviewed and edited by experts in these respective fields.
For each formula, all variables and operations are clearly defined. See the ‘Engineering Formulas‘ page as an example.
For fields with differing schools of thought, different formulas are housed in their own sections (as is the case with ‘Applied Mechanics‘, and others).
Biology Online: Registration is free on this site, which hosts digital books, article links, tutorials, and a dictionary of biology-related terminology.
The site's forum lets users post questions and take part in biology-oriented discussions.
Another popular feature of the site is a monthly blog that covers topics like allergy season, botany, and obesity.
Published authors are invited to share their work on the site and receive feedback from other registered users.
Biology Reference: Simple and easy-to-use, this alphabetized directory of biology topics features detailed encyclopedic entries written by on-site authors.
TAUAll articles feature a bibliography of sources and comment field for readers to provide feedback.
A significant amount of interlinking between entries allows users to browse similar topics with relative ease.
Ptable: This illustrated guide to the Periodic Table of Elements features definitions of all elements, as well as information related to orbitals, isotopes, compounds, and other fundamentals of chemistry.
All element definitions are linked to their corresponding Wikipedia pages.
The interactive diagrams allow users to toggle boiling/melting point, electronegativity, density, and other comparative aspects of different elements.
ChemnetBase: This database of reference materials includes guides to specific scientific topics, such as the ‘Combined Chemical Dictionary‘ and the ‘Dictionary of Drugs.' Subscriptions to the site are not free, but all new members receive a free thirty-day trial.
The site also includes a section dedicated to ‘Librarian Resources.'
The site also includes a section dedicated to ‘Librarian Resources.'
‘Subject Collections‘ of e-books pertaining to 43 different professional fields are housed on individual pages.
A digital copy of the ‘CRC Handbook of Chemistry and Physics' is viewable in the read-only format, while hard copies are available for purchase on the site.
Chemtutor: Recognized by the National Science Foundation and SchoolZone, Chemtutor provides study guides related to 16 generalized chemistry subjects, including elements, kinetics, gases, and acids/bases.
All lesson plans are illustrated, and feature practice problem sets for new learners to complete.
The site features a search tool that allows visitors to browse different lesson plans for specific topics.
The site's link directory is powered by PSIGate, a search engine that exclusively yields pages related to the physical sciences.
PhysLink: This collection of learning tools related to physics and astronomy includes a directory of articles sorted by general topic, resources for educators, a job board for aspiring physicians and astronomers, and an online store.
The Physics and Astronomy Directory contains lists of university departments, student and professional associations, academic journals, and other resources pertaining to these two subjects.
Visitors can pose questions and receive feedback from experienced professionals, thanks to the ‘Ask the Experts‘ tool.
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