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For referencing in Wikipedia, see Citing sources.

In general, a reference is something that refers to or designates something else, or acts as a connection or a link between two things. The objects it links may be concrete, such as books or locations, or abstract, such as data, thoughts, or memories. The object which is named by a reference, or to which the reference points, is the referent.

The term reference is used with different specialized meanings in a variety of fields, as follows:

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Library of Congress: What's New in Science Reference

Update Tracer Bullet: Environmental Science Projects
This guide provides sources to assist middle school students and teachers in planning, preparing, and executing environmental science fair projects and updates Environmental Science Projects (TB 97-6).
Upcoming Lecture: Dinosaurs Along the Silk Road
During the past seven years, James M. Clark has been part of a team that found the bones of small dinosaurs mired in mud, stacked one on top of another, in the northern part of Xinjiang, China, near the ancient Silk Road. In this illustrated lecture Clark will show images of his work in the Gobi and discuss the discoveries made by his expeditions and by others. Many of the discoveries provide critical support for the hypothesis that birds evolved from dinosaurs, and he will discuss this controversial theory. The lecture is free and open to the public; tickets and reservations are not needed. Dinosaurs Along the Silk Road Wednesday, June 24, 11:30 a.m Mary Pickford Theater on the third floor of the James Madison Building 101 Independence Ave. S.E., Washington, D.C. Press contact: Donna Urschel, (202) 707-1639 Public contact: Science, Technology & Business Division, (202) 707-5664
Updated Selected Internet Resources in Zoology

New Everyday Mystery: How do spiders avoid getting tangled in their own webs?
The sticky, complex nets of silk are effective hunting tools for catching prey, but how do the spiders themselves avoid entangling themselves in their own webs?
New Webcast: Healthy Bites. Great-Tasting, Healthy Food on a Budget
Sally Squires, award-winning journalist and former syndicated nutrition columnist of the Lean Plate Club in the Washington Post, discussed "Healthy Bites: Great-Tasting, Healthy Food on a Budget."
Upcoming lecture: Are We Alone? Astrobiology and the Search for Extraterrestrial Life
Daniel P. Glavin, an astrobiologist at NASA’s Goddard Space Flight Center will present "Astrobiology: Are We Alone?" at 11:30 a.m. on Tuesday, June 2, in the Mary Pickford Theater on the third floor of the James Madison Building, 101 Independence Ave. S.E., Washington, D.C. The event is free and open to the public; tickets are not required.

 
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Physics and Science Reference by PhysLINK.com - Includes physical constants, online unit conversions, periodic table of elements, exact time, fundamental physical formulae and equations.
Meta Description: [ Physics, astronomy and greneral science reference, physical constants, online unit conversions, periodic table of elements, exact time, fundamental physical formulae and equations and more - by PhysL ]

Astronomical Constants from NASA - Astronomical/space constants and equations.

Beta-Theta - Gives general defintions, background and examples from the science fields of biology, physics, chemistry, math, and history. Includes forum boards.
Meta Description: [ Get Homework Help now at Beta-Theta. Offering online education services for free to students from across the globe. A good, clean website with fast loading time and no pop up ads. ]

EquationSheet.com - Searchable directory, arranged by field, of equations, constants, symbols and SI units. Also features LaTEX utilities, software links.
Meta Description: [ Create a personal Equation Sheet from a large database of science and math equations including constants, symbols, and SI units. Large equation database, equations available in LaTeX and MathML, PNG image, and MathType 5.0 format, scientific and mathematical constants database, physical science ... ]

GrayLIT Network - Searchable database for reports that are generated by federally funded projects.
Meta Description: [ Provides a full-text search across the gray literature of multiple government agencies within a science portal of technical reports ]

RefScout - A weekly, scientific reference mailing service. Screens databases covering life and medical sciences for the key words or the combination of key words specified and will automatically update with any abstract that has come up during the last seven days. Free service.
Meta Description: [ RefScout - the weekly scientific reference mailing service! ]

The Constants and Equations Pages - Expanding reference resource for science, math and astronomy
Meta Description: [ Over 600 alphabetically listed Constants, aspects of maths, some 450 equations,Additions & Multiplication tables, Interactive conversions and details on all the standard SI units identities, including complex numbers of measurement, Greek alphabet, electronic symbols and mathematical symbols ]

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