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Repository for free public domain photos. If you intend to use an image you find here for commercial use, please be aware that no model release was obtained and pictures featuring products or property should be used with care. The pictures are free for you to use and you should feel good about doing so.

Excellent graphics and animations of complex biological science topics as well as virtual experiments you could not do in a normal public school classroom.

Most NOAA photos and slides are in the public domain and CANNOT be copyrighted. Although at present, no fee is charged for using the photos credit MUST be given to the National Oceanic and Atmospheric Administration/Department of Commerce unless otherwise instructed to give credit to the photographer or other source.

Organized by the Smithsonian Photography Initiative (SPI) as a series of integrated programs, click! photography changes everything invites the public to consider ways in which photography enables us to see, experience, and interact with the world.

Most of the media in these collections are in the public domain or are attached to generous copyright licensing. Though you may not need to ask permission to use them when publishing on the Web for educational purposes, you should cite or attribute these

Most of the media in these collections are in the public domain or are attached to generous copyright licensing. Though you may not need to ask permission to use them when publishing on the Web for educational purposes, you should cite or attribute these images to their creators unless otherwise notified! If you see any copyright notices on these pages, read them for further instructions.

Calisphere is the University of California's free public gateway to a world of primary sources. More than 150,000 digitized items - including photographs, documents, newspaper pages, political cartoons, works of art, diaries, transcribed oral histories, advertising, and other unique cultural artifacts - reveal the diverse history and culture of California and its role in national and world history.

British Journal of Educational Technology Vol 37 No 5 2006 761-783 doi:10.1111/j.1467-8535.2006.00560.x Blackwell Publishing Ltd.Oxford, UKBJETBritish Journal of Educational Technology0007-1013British Educational Communications and Technology Agency, 20052005375761783Articles Developing a comprehensive metric British Journal of Educational Technology Developing a comprehensive metric for assessing discussion board effectiveness Robin H. Kay Assistant Professor, Faculty of Education, University of Ontario Institute of Technology, Oshawa, Ontario, Canada. Email: Robin.Kay@uoit.ca Abstract The use of online discussion boards has grown extensively in the past 5 years, yet some researchers argue that our understanding of how to use this tool in an effective and meaningful way is minimal at best. Part of the problem in acquiring more cohesive and useful information rests in the absence of a comprehensive, theory-driven metric to assess quality and effectiveness. Based on an extensive review of the research, the following variables were used to assess traditional discussion board use: thread, location of message within thread, author (student vs. educator), subject line clarity, time of posting, response time from previous message, number of times message was read, number of words, primary purpose, message quality, difficulty level of topic, knowledge level, processing level and use of external resources. These variables proved to be effective in assessing 12 key areas of discussion board use. It is argued that this kind of metric is essential if we wish to advance our understanding of online discussion boards for both educators and researchers. Overview The use of online discussion boards has grown extensively in the past 5 years (Cooper, 2001). While this tool is viewed as revolutionary by some researchers (Hara, Bonk & Angeli, 1998; Li, 2003), others argue that our understanding of how to use online discussion in an effective and meaningful way is limited (Blignaut &

My Wordle for online Teaching module Robin Kay's Abstract 'Developing a comprehensive metric for assessing discussion board effectiveness'

Visual News is a publication featuring artists who are doing great work. Visual News also serves as an outlet for Column Five to publish visual representations of newsworthy events.

US Department of Agriculture Image Library

Oldie but a decent one from the government for images and pictures. Remember that with most government sites you are free to use the pictures but some such as NASA do require that you cite the source.