Science.gov is a gateway to authoritative selected science information provided by U.S. Government agencies, including research and development results.

Science.gov is a gateway to authoritative selected science information provided by U.S. Government agencies, including research and development results. Agriculture & Food Food Safety, Gardening, Pesticides, Veterinary Science Applied Science & Technologies Biotechnology, Electronics, Engineering, Transport Astronomy & Space Exploration, Planets, Space Technologies Biology & Nature Animals & Plants, Ecology, Genetics, Pest Control Computers & Communication Networks, Hardware, Software Earth & Ocean Sciences Land, Maps, Natural Disasters, Oceans, Weather Energy & Energy Conservation Energy Use, Fossil Fuel, Solar, Wind Environment & Environmental Quality Air/Water/Noise Quality, Cleanup, Climate Change Health & Medicine Disease, Health Care, Nutrition, Mental Health Math, Physics, & Chemistry Astrophysics, Chemicals, Mathematical Modeling Natural Resources & Conservation Ecosystems, Energy Resources, Forest Science, Mining Science Education Homework Help, Teaching Aids, Science Internships

Scirus is the most comprehensive science-specific search engine on the Internet. Driven by the latest search engine technology, Scirus searches over 167 million science-specific Web pages.

The Sheffield Chemdex: the directory of chemistry on the WWW since 1993.

Prepared by the Southern Soybean Disease Workers (SSDW). SSDW is an organization of pathologists, nematologists, extension scientists, industry personnel, and private consultants involved with soybean production and research in the southern United States. These states include Delaware, Maryland, Virginia, North Carolina, South Carolina, Georgia, Florida, Kentucky, Tennessee, Alabama, Mississippi, Missouri, Arkansas, Louisiana, Texas, and Oklahoma.

The Specialized Information Services (SIS) Division of the National Library of Medicine (NLM) is responsible for information resources and services in toxicology, environmental health, chemistry, HIV/AIDS, and specialized topics in minority health.

From its inception, the Stanford Encyclopedia of Philosophy (SEP) was designed so that each entry is maintained and kept up to date by an expert or group of experts in the field. All entries and substantive updates are refereed by the members of a distinguished Editorial Board before they are made public. Consequently, our dynamic reference work maintains academic standards while evolving and adapting in response to new research.

Online encyclopedia of western signs and ideograms. Symbols.com contains more than 1,600 articles about 2,500 Western signs, arranged into 54 groups according to their graphic characteristics.

English, Medical, Legal, and Computer Dictionaries, Thesaurus, Encyclopedia, a Literature Reference Library, and a Search Engine all in one!

Search and browsw the library. Mathmatics topics: Algebra, Analysis, Arithmetic/Early Math, Calculus (Single Variable), Calculus (Multivariable), Communicating Math, Differential Equations, Discrete Math, Dynamical Systems (Chaos, Fractals...), Geometry, History and Biography, Logic/Foundations, Number Theory, Numerical Analysis, Operations Research, Pre-Calculus (Functions, Inequalities, Trigonometry), Probability/Statistics, Topology, Applications/Connections. Educational materials. Teaching issues/strategies.

The National Academies Press (NAP) was created by the National Academies to publish the reports issued by the National Academy of Sciences, the National Academy of Engineering, the Institute of Medicine, and the National Research Council, all operating under a charter granted by the Congress of the United States. NAP publishes over 200 books a year on a wide range of topics in science, engineering, and health, capturing the most authoritative views on important issues in science and health policy. The institutions represented by NAP are unique in that they attract the nation's leading experts in every field to serve on their blue ribbon panels and committees. For definitive information on everything from space science to animal nutrition, you have come to the right place. Read more than 3,000 books online for FREE! New Releases. Ordering info.

This public service is cooperatively provided by the two time agencies of United States: a Department of Commerce agency, the National Institute of Standards and Technology (NIST), and its military counterpart, the U. S. Naval Observatory (USNO). Readings from the clocks of these agencies contribute to world time, called Coordinated Universal Time (UTC). The time maintained by both agencies should never differ by more than 0.000 0001 seconds from UTC (see recent comparisons).

This Javascript program makes possible the conversion between a large number of different units. The basic units are represented by mathematical symbols, which can be combined to yield more complicated expressions [like, for example, m/s, kg(m/s)^2, kcal/mol, hbar^2/(2 me), etc...]. As many physical constants are included, it is also possible to evaluate simple formulas involving these constants. Other facilities, such as conversion to predefined systems of units (CGS, atomic units, ...) as well as special conversions (temperature/energy, mass/energy, ...) are also available. The values of the physical constants are taken form The CODATA Internationally recommended values.

A simple, easy to use website with various tools for finding time and date information, including a world clock with the time in various locations and time zones around the world, a time zone converter, personal world clock, countdown to the new year, monthly calendar, and more.

Geometric. Angle. Length -inch, foot, mm, mile, meter. Area. Volume. Kinematics. Time. Velocity -mph, km/hr, ft/s, knot. Acceleration. Volume Flow Rate. Kinetics. Mass -lbm, kg, oz, carat, slug. Density. Force -lbf, kgf, newton, dyne, more. Moment/Torque. Pressure:psi, in-Hg, in-H2O, torr, bar. Energy, Power -hp, watt, Btu/s, ton (refrig.). Temperature, Viscosity, Electric, Luminous, Magnetic, Thermal, Permeability, Wire Gages, Sheet Metal Gages, Hardness, more categories... Currencies (updated daily): US Dollar, Euro, Japanese Yen, Chinese Yuan (Renminbi), more... Fundamental Constants: Mathematical, Universal, Atomic, Physical, Electro-Magnetic.