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On February 19, 2003, DP posted its 1,000th project to PG. In August, 2003, the project set a record of 129,273 pages proofread in one month. On September 3, 2003, DP posted its 2,000th project. On October 15, 2003, PG published its 10,000th ebook, a goal which was set in 1971. On January 14, 2004, DP posted its 3,000th project. On April 8, 2004, DP posted its 4,000th book. On August 21, 2004, DP posted its 5,000th project. On October 8, 2004, DP posted its 5,000th unique title. On February 2, 2005, DP posted its 6,000th unique title. On June 27, 2005, DP posted its 7,000th unique title. On February 8, 2006, DP posted its 8,000th unique title. On September 11, 2006, DP posted its 9,000th unique title. On March 9, 2007, DP posted its 10,000th unique title. On September 12, 2007, DP posted its 11,000th unique title. In September, 2008, DP posted its 14,000th unique title. In October, 2009, DP posted its 16,000th unique title. In June, 2010, DP posted its 18,000th unique title. The project celebrated its tenth anniversary on October 4, 2010.

To participate, create an account, then select a proofreading project from a list. A proofreading interface is displayed in your web browser, and you can proofread pages for the project one at a time. The project has personal stats pages and rankings for proofreaders so that each proofreader can see how he or she is doing compared to other proofreaders. You can also become a project manager and prepare proofreading projects for the site, and you can reassemble proof-read projects for submission to Project Gutenberg.

Join a discussion forum about this project.

Audio versions of some of the books in Project Gutenberg are being created in the Gutenberg Audio Books project.

Read a November 15, 2005, interview of Michael Hart, the founder of Project Gutenberg, by Dr. Samuel Vaknin.

The project submitted its first book to Project Gutenberg on February 9, 2004. It submitted its 100th book to Project Gutenberg on March 31, 2005.

To participate, create an account, then select a proofreading project from a list. A proofreading interface is displayed in your web browser, and you can proofread pages for the project one at a time. The project has personal stats pages and rankings for proofreaders so that each proofreader can see how he or she is doing compared to other proofreaders. You can also become a project manager and prepare proofreading projects for the site, and you can reassemble proof-read projects for submission to Project Gutenberg.

Join a discussion forum about this project.

To participate, create an account, then select a proofreading project from a list. A proofreading interface is displayed in your web browser, and you can proofread pages for the project one at a time. The project has personal stats pages and rankings for proofreaders so that each proofreader can see how he or she is doing compared to other proofreaders. You can also become a project manager and prepare proofreading projects for the site, and you can reassemble proof-read projects for submission to Project Gutenberg Canada.

Join a discussion forum about this project.

Starting on November 9, 2006, the project is offering participants a US$25 Amazon.com gift certificate if they submit 1000 accepted entries. Only entries submitted after November 9, 2006 will count. Each participant can earn a lifetime maximum of 20 gift certificates. A maximum of 900 gift certificates will be awarded. 777 gift certificates have been awarded as of June 18, 2008. The project has temporarily stopped awarding gift certificates as of January, 2009.

This project is part of the OpenMind Initiative to develop "intelligent" software.

To participate in the project, sign up for a user account, then click on the Play Now button. Your browser should load a Java applet in a new window and provide further instructions for playing the game.

Learn more about the algorithms behind the project in the project owner's blog.

Join a discussion forum about the project.

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The project may have found its first particle on March 7, 2010.

From the project website: "Finding the incredibly tiny interstellar dust impacts in the Stardust Interstellar Dust Collector (SIDC) will be extremely difficult. Because dust detectors on the Ulysses and Galileo spacecraft have detected interstellar dust streaming into the solar system, we know there should be about 45 interstellar dust impacts in the SIDC. These impacts can only be found using a high-magnification microscope with a field of view smaller than a grain of salt. But the aerogel collector that we have to search enormous by comparison, about a tenth of a square meter (about a square foot) in size. The job is roughly equivalent to searching for 45 ants in an entire football field, one 5cm by 5cm (2 inch by 2 inch) square at a time! More than 1.6 million individual fields of view will have to be searched to find the interstellar dust grains. We estimate that it would take more than twenty years of continuous scanning for us to search the entire collector by ourselves."

As of September 6, 2006 the project has identified several possible interstellar dust tracks. Now the project owners have to figure out the best way to remove the tracks from the aerogel so the tracks can be examined more closely. On Septmeber 18, 2006, the CAPTEM Stardust Oversight Committee met to decide how best to investigate the potential interstellar dust tracks. On September 26, they decided to learn what they can from viewing the tiles from different sides, while experimenting with ways to remove the tracks using the "flight spare" tile. As of October 6, 2006, over 20 million searches have been completed by project participants, and more than 1/4 of of the aerogel collector has been scanned. As of December 1, 2006, "about 600 high-resolution focus movies of candidate extraterrestrial tracks" have been created. The movies will be analyzed at Berkeley. As of June 8, 2007, the project is practicing extracting insterstellar dust tracks preparing to extract actual insterstellar dust tracks. Phase 1 of the project completed successfully at the end of July, 2007. In the 11 months that phase lasted, participants analyzed over one third of the tiles and identified several dozen candidate tracks. Phase 2 began on August 10, 2007. This phase doubled the resolution of the focus movies to find even smaller candidate dust tracks. Phase 3 began on March 22, 2010. This phase looks for "midnight tracks," tracks with an unusual 90 degree angle of entry into the detector.

On February 13, 2008, the first track, I1017,2, was physcially extracted from the Stardust interstellar dust collector. The particle at the end of the track is 200 microns below the surface. More information about the extraction is available in the project's blog. Non-desctructive synchrotron x-ray fluorescence analysis of the first track was completed during the last week of February, 2008. The particle contains large amounts of iron and nickel, two elements common in extraterrestrial materials. A status update for the results of the first 6 tracks was given on July 31, 2008. None of the tracks appear to be Interstellar.

On January 20, 2010, the project found a probable interstellar dust particle, named Orion. The particle was found in an unpredicted "midnight" track, a track with an angle of 90 degrees.

On January 14, 2009, the project posted an Interstellar Preliminary Examination - Update, a 10-minute narrated slide show about the ISPE and the first of a series of updates. See all of the updates.

On October 15, 2009, the project published its first "Duster" paper, "Non-destructive search for interstellar dust using synchrotron microprobes." This peer-reviewed journal article includes some project participants (i.e. Dusters) among its authors.

See an image that shows which aerogel tiles have been scanned and which are in progress.

See the Alpha List (login required) of the best candidate particle tracks discovered so far.

See a live webcam view of the Stardust Cleanroom at the Johnson Space Center. See images of comet particles retrieved from Stardust. The images were released on February 20, 2006. See a Stardust status update published on February 21, 2006, and ISPE Update Six.

Join a discussion forum about the project.

The botanical records created by the project are immediately made public on the project website and will also be given to national and international biodiversity databases. The project is supported by the Botanical Collections Managers Group, with specimens for the pilot project coming from Manchester Museum's herbarium. Once the project is well-established, it will be expand to include other collections.

You can participate in the project by viewing images of herbarium sheets through the project website and by transcribing the details from each sheet label (for example the species name, collector, date of collection, site, etc.). You don't need any particular botanical experience in order to help. To participate, sign up for a user account at the project website, then click the Allocate Specimens link (or select a page from the "Sheets to document" section.

Join a discussion forum about the project (registration is required).

To participate in the project, look for a collection of links on the right side of the main page, under the headers "Pages:" and "Links." These links explain how to participate in the "discovery and characterization of extrasolar planets." You can download a Java-based software package to work with extrasolar planet data and you can use the Systemic Backend collaborative environment to work with other amateur searchers.

On February 18, 2009, the project began Galaxy Zoo 2, which asks participants to provide more detailed classification data for the project's 250,000 "brightest and most interesting galaxies." The project reached its initial goal of 40 million classification by October 9, 2009. It reached 50 million clasisfications by December 2, 2009. It reached its goal of 60 million classifications on April 11, 2010.

On April 23, 2010, the project began Galaxy Zoo Hubble, which asks participants to classify galaxies from hundreds of thousands of images from the Hubble Space Telescope.

On May 30, 2008, the project was approved for 7 orbits of observation time from the Hubble Space Telecope (HST) sometime after the telescope is serviced in October, 2008. Galaxy Zoo will observe the Voorwerp object, which was first discovered by a Galaxy Zoo participant.

On April 1, 2009, at about 7 PM EST (midnight UTC, April 2), the project began a challenge to classify 1 million galaxies in 100 hours, to celebrate 100 Hours of Astronomy. Project participants classified 1.5 million galaxies by the end of the challenge. Also, on April 3, 2009, the project classified its 20 millionth galaxy.

On June 18, 2009, the project submitted its 11th paper, "Galaxy Zoo: Exploring the Motivations of Citizen Science Volunteers", to Astronomy Education Review. On August 5, 2009, the project submitted a new paper, "Reproducing Galaxy Morphologies Via Machine Learning." The paper demonstrates that by using the visual classifications generated by Galaxy Zoo to train an artificial neural network to identify galaxies, the network can identify new galaxies with greater than 90% accuracy. Computers will help humans keep up with the quickly increasing amounts of new data generated in the future.

On January 13, 2010, a paper titled "Galaxy Zoo: Dust in Spirals" studying the dust content of spiral galaxies was published.

On January 18, 2010, a paper on AGN host galaxies (galaxies whose supermassive black holes are feeding/growing) that the project submitted in 2009 was accepted by the Astrophysical Journal.

The project began its bar drawing sub-project on September 18, 2009, and completed it on January 27, 2010. The project asked for participants' help "with more detailed classifications and to perform some new tasks for a selection of galaxies, some of which have 'bars'. We use the Google Maps interface to allow you to draw and manipulate lines and ellipses, performing crucial tests of automated pipelines and acquiring information which has never before been captured.

"Your help will enable us to better understand how bars effect their hosts. Our complete science rational can be seen here.

To participate in the project, complete a tutorial to learn how to classify galaxies, then view images via the project website and classify them.

Join a discussion forum about the project.

To participate in the project, follow the instructions on the Participate page.

The game "takes players through a series of practice levels designed to teach the basics of protein folding, before turning them loose on real proteins from nature. 'Our main goal was to make sure that anyone could do it, even if they didn't know what biochemistry or protein folding was.' At the moment, the game only uses proteins whose three-dimensional structures have been solved by researchers. But ...'soon we'll be introducing puzzles for which we don't know the solution.'"

This project is participating in the CASP8 protein structure prediction contest, which occurs between May 5, 2008 and August 1, 2008. Results from the contest will be released at the CASP meeting on December 3-7, 2008. To prepare for the contest, the project has released some CASP warmup puzzles (Fibronectin, E. coli, Human Fyn 2, Transduction).

To participate in the project, register for an account at the game's website, then download the Windows client and start playing. A Linux client may be available soon.

To participate in the project, follow links to the project's web pages of images, view the images, and add a comment to the project's blog if you find anything interesting in the images.

To participate in the project, click the "Give me a random speech that needs timestamping" link on the project website. On the next web page view the video and click the "Now" button when you hear the piece of text that is displayed below the video. Participants can register if they want to be included in the websites statistics rankings, but they can also participate without registering.

From an August, 2008, news article: "In the first full year of reCAPTCHA's operations, 1.2 billion reCAPTCHA puzzles have been solved and more than 440 million words deciphered. This is the equivalent of manually transcribing more than 17,600 books. Four million words are now being transcribed per day."

"It would take more than 1,500 people working 40 hours a week at a rate of 60 words a minute to match the weekly output of the CAPTCHA project. Amazingly, the reCAPTCHA team has managed to leverage unused human "cycles" for the common good."

To participate in the project, incorporate the reCAPTCHA web service into your website or use this reCAPTCHA. You can also use a reCAPTCHA on the project's Learn More web page.

To participate in the project, follow the instructions on the Participate page.

To participate in the project, study the How to Take Part page at the project website, then view images via the project website and classify them.

Join the Galaxy Zoo discussion forum.

The project's first paper, Galaxy Zoo: Bars in Disk Galaxies, a study of whether bars kill spiral galaxies, was accepted by the Monthly Notices of the Royal Astronomical Society on November 11, 2010.

To participate in the project, study the How to Take Part page at the project website, then view images and simulations via the project website and classify the simulations.

Join the Galaxy Zoo discussion forum.

Watch project participants' "walks on the moon" in real time with Moon Zoo Live.

See the latest discoveries and project news in the Galaxy Zoo blog and twitter feed.

To participate in the project, study the How to Take Part page at the project website, then view images of the moon's surface and mark craters in the images.

Join the Moon Zoo discussion forum.

To participate in the project, click one of the links on the Start Mapping page to Map Mars or Count Craters, then follow the instructions on the next page. You can create a free account on the site if you'd like to track your contributions: you may also participate anonymously.

To participate in the project, create an account on the project website, browse the images that HiRISE has already captured, then suggest new locations.

To participate in the project, create an account on the project website and follow the instructions for participating.

Join the Solar Stormwatch discussion forum.

To participate in the project you do not need to have any astronomy experience and you do not need any equipment other than your eyes and a star finder chart which is available from the project website. Participants can learn from the project website how to participate in the project.

Join the project's discussion forum.

Watch the project's progress on its online map.

To participate in the project you do not need to have any specific scientific training. Learn more about getting involved.

Join the project's discussion forum.

The 2010 campaign began on March 3 and ended on March 16. Participants in 86 countries contributed over 17,800 measurements. See the measurement results. "The dots (or points) ... represent the contributed measurements of night sky brightness: the lighter colored the dot, the brighter the sky and the darker the dot, the darker the sky."

To participate in the project, follow the instructions on the project website.

Subscribe to the project's mailing list to receive updates and results from the project.

To participate in the project, follow the instructions on the project's participate page. Registration is optional.

Join the project's discussion forum.

To participate in the project, sign up for a user account or play as a guest, then click the "Start labeling" button. Your browser should load a Java applet in a new window and provide further instructions for playing the game.

Season 1 began on March 3, 2010 and ended on May 12, 2010. Over 18,500 players or "agents" from over 150 countries completed more than 30,000 missions and quests.

Season 2 is being designed as of May 7, 2010.

To participate in the project, follow the directions on the project's How to Play page.

To participate in the project, create an account on the project website, then click the "Explore Your Morals" button.

To participate in the project, register for an account, then log in and view satellite images, placing markers for roads, rivers, modern structures and other objects on the image. You will mark objects on a series of test images to learn what to look for in actual images. Note: you may need to scroll the image up, down, left and right with your mouse inside the image viewer to see all of the image.

To participate in the project, follow the links on the Play page to play a game. You may play anonymously or you may register for an account so you can track your scores. In a series of timed puzzles, rearrange sequences of colored blocks to find the best match between the sequences. The project's Tutorial explains the game very simply and quickly and allows you to practice before playing the actual game.

To participate in the project, read the instructions for How to Play, then register for an account if you wish to, and Play the game.

To participate in the project, create an account on the project website and follow the instructions for participating.

Join the Planet Hunters discussion forum.