Top Sites

The top ranked sites in each category. Many listings in Top Sites by Category are for specific pages or subdirectories, not for entire sites. For example, in the Reference > Maps section you'll find mapquest.com (an entire site about maps) and maps.yahoo.com (one section about maps on a larger site).

For this reason, the listings in the Top Sites by Category are ordered by Popularity of this listing, and not by the overall Traffic Rank of the site. We use the same basic traffic ranking technology used for Alexa Traffic Rank — a combination of users and page views — but apply it only to the traffic for that specific listing. To find out the Traffic Rank of any site in the Top Sites by Category directory, just click the name of the site and you'll be taken to the "Site Info" page for that site.

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Top Sites in:



  • 1

    PhysOrg.com

    physorg.com
    Science, physics, nanotech, technology, space news and a scientific forum.

  • 2

    Physics Forums

    physicsforums.com
    Bulletin boards on physics and related subjects. Includes related polls and a list of active th... Morereads.

  • 3

    Wolfram Research, Inc.

    wolfram.com
    U.S. operations for the makers of Mathematica, a fully integrated technical computing software ... Morepackage. Includes online ordering and other information.
    From the site: Founded by Stephen Wolfram in 1987, Wolfram Research is one of the world's most respected software companies--as well as a powerhouse of scientific and technical innovation. As pioneers in computational science and the computational paradigm, we have pursued a long-term vision to develop the science, technology, and tools to make computation an ever-more-potent force in today's and tomorrow's world. ...

  • 4

    arXiv.org e-Print Archive

    arxiv.org
    Fully automated electronic archive and distribution server for research papers, hosted at the L... Moreos Alamos National Laboratory.

  • 5

    CERN

    cern.ch
    European Laboratory for Particle Physics. Includes an introduction of the laboratory, informati... Moreon on experiments being conducted, publication archives, photos and press releases.

  • 6

    Max Planck Society

    mpg.de
    Provides information on the society, the Institutes, research, documentation and multimedia. Ge... Morerman and English.
    From the site: Eight Nobel Prize winners of the Max Planck Society meet their President, Peter Gruss. The research institutes of the Max Planck Society perform basic research in the interest of the general public in the natural sciences, life sciences, social sciences, and the humanities. In particular, the Max Planck Society takes up new and innovative research areas that German universities are not in a position to accommodate or deal with adequately. ...

  • 7

    LBNL

    lbl.gov
    Lawrence Berkeley National Laboratory... More
    From the site: Berkeley Lab's Computing Sciences organization researches, develops, and deploys new tools and technologies to meet these needs and to advance research in such areas as global climate change, combustion, fusion energy, nanotechnology, biology, and astrophysics. The Computing Sciences organization was created to advance computational science throughout the Department of Energy's

  • 8

    American Institute of Physics

    aip.org
    Gateway for news, jobs, and other physics resources. AIP is a STM publisher of research journal... Mores, proceedings and other scientific publications. AIP provides services for scientific societies including membership and subscription management.
    From the site: Physics Today , the flagship publication of The American Institute of Physics , is the most influential and closely followed physics magazine in the world, informing readers about science and its place in the world with authoritative features, full news coverage and analysis, and fresh perspectives on technological advances and ground-breaking research. ...

  • 9

    Lessons in Electric Circuits

    allaboutcircuits.com
    Online book by Tony R. Kuphaldt on dc and ac electric circuits, semiconductor devices, analog a... Morend digital circuits.

  • 10

    American Physical Society (APS)

    aps.org
    Information, member directory and many links.... More
    From the site: APS Mission "In the firm belief that an understanding of the nature of the physical universe will be of benefit to all humanity, the Society shall have as its objective the advancement and diffusion of the knowledge of physics." ... Find out more about APS Units . ... APS has a number of statements on education, ethics and values, human rights, internal policy, international affairs, and national policy. ... For a copy of the APS logo for use on Unit communications, please contact: ...

  • 11

    Argonne National Laboratory (ANL)

    anl.gov
    ANL conducts research in four broad categories: basic science, scientific facilities, energy re... Moresources, and environmental management, with programs ranging from studies of the atomic nucleus to global climate change research. Located at sites in Argonne, Illinois, and Idaho Falls, Idaho.
    From the site: Argonne National Laboratory is one of the U.S. Department of Energy's largest research centers. It is also the nation's first national laboratory, chartered in 1946. Recognized for its excellence in connecting basic research to innovative technology, Argonne is a direct descendant of the University of Chicago's Metallurgical Laboratory, part of the World War Two Manhattan Project. ...

  • 12

    The Institute of Physics

    iop.org
    The site for physics and physicists, including information on Institute membership and activiti... Morees, online news, books, magazines and journals.

  • 13

    INFN

    infn.it
    Italian National Institute for Research in Nuclear and Subnuclear Physics.

  • 14

    NASA Astrophysics Data System

    adsabs.harvard.edu
    Search system for abstracts in astrophysics, planetary sciences and solar physics.

  • 15

    Los Alamos National Laboratory (LANL)

    lanl.gov
    Research and development directed at enhancing the security of nuclear weapons and nuclear mate... Morerials worldwide and managing the national nuclear stockpile. Located in Los Alamos, New Mexico.
    From the site: Los Alamos National Laboratory is a premier national security research institution, delivering scientific and engineering solutions for the nation's most crucial and complex problems. Our primary responsibility is ensuring the safety, security, and reliability of the nation's nuclear deterrent. The Los Alamos of today emphasizes worker safety , effective operational safeguards & security , and environmental stewardship , while outstanding science remains the foundation of the Laboratory. ...

  • 16

    The Physics Classroom

    physicsclassroom.com
    Offering help for the high school physics student with dynamic animation examples, problem sets... More and a comprehensive guide to the material.
    From the site: Questions regarding technical issues with the web site should be sent to: webmaster@physicsclassroom.com

  • 17

    Fermi National Accelerator Laboratory (FNAL or Fermilab)

    fnal.gov
    Fermilab explores the fundamental nature of matter and energy by providing leadership and resou... Morerces for qualified researchers to conduct basic research at the frontiers of high energy physics. Located in Batavia, Illinois.
    From the site: Send us an email at ferminews@fnal.gov with your name, your experiment, and the languages you speak. We'll keep an updated tally on this webpage.

  • 18

    Stanford Linear Accelerator Center (SLAC)

    slac.stanford.edu
    SLAC is one of the world's leading research laboratories. The laboratory designs, constructs an... Mored operates state-of-the-art electron accelerators and related experimental facilities for use in high-energy physics and synchrotron radiation research.
    From the site: Send submissions to tip@slac.stanford.edu , or mail to TIP Editor, MS 58, Stanford Linear

  • 19

    Thomas Jefferson National Accelerator Facility (TJNAF)

    jlab.org
    Jefferson Lab is a basic research laboratory built to probe the nucleus of the atom to learn mo... Morere about the structure of matter. Located in Newport News, Virginia.
    From the site: Take a brief tour of the future science at Jefferson Lab with the 12 GeV Upgrade. ... Like a giant, powerful microscope, Jefferson Lab's CEBAF accelerator allows scientists to peer into matter to study the tiniest particles that comprise it. Scientists use telescopes to study stars and microscopes to study living cells. At Jefferson Lab, they use the CEBAF accelerator and its three experimental halls to study the stuff of stars, cells and everything in between. ...

  • 20

    Scitation

    scitation.aip.org
    Scitation is the re-launch of the Online Journal Publishing Service (OJPS). Cookies required to... More use the site.

  • 21

    Bulletin of the Atomic Scientists

    thebulletin.org
    Reports on global security, arms control, military affairs, climate change, as well as nuclear ... Moreissues. Back articles are available online.
    From the site: Chicago, IL 60602 (312) 364-9710 ext. 10 aharris@thebulletin.org

  • 22

    SPIE-International Society for Optical Engineering

    spie.org
    SPIE is dedicated to advancing the scientific research and engineering applications of optics, ... Moreoptical, photonic, imaging and optoelectronic technologies through international conferences, education programs and publications.
    From the site: SPIE is an international society advancing an interdisciplinary approach to the science and application of light. ... SPIE constituents work in a wide variety of fields that utilize some aspect of optics and photonics, which is the science and application of light. More specifically, optics is a branch of physics that examines the behavior and properties of light and the interaction of light with matter. ...

  • 23

    National Centre for Laser Applications

    ncla.ie
    The National Centre for Laser Applications (NCLA) conducts research and development of laser ma... Moreterials processing. Research areas of interest include micromachining, cutting, marking, welding, and surface modification.

  • 24

    The National Center for Supercomputing

    ncsa.illinois.edu
    Information about supercomputing applications and research in the United States.

  • 25

    Particle and Nuclear Physics Laboratory - Triumf

    triumf.ca
    A joint venture of several Canadian Universities which conducts subatomic physics research.... More
    From the site: T he giant TRIUMF cyclotron accelerates negatively charged hydrogen ions to 75% of the speed of light. Intense beams of protons are then directed out of the cyclotron. At these energies (75% of the speed of light = 225,000 km/second), short-lived particles called pions can be created (at a rate 1,000 times greater than that of earlier accelerators). And because TRIUMF is so efficient at creating pions (also called "pi-mesons"), the facility is known as a meson factory. ...

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