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Operating Operating Systems Systems By By Rachel Libercci Rachel Libercci Kim Bley Kim Bley
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Page 1: Operating Systems by Kim and Rachel

Operating Operating SystemsSystems

ByBy

Rachel LibercciRachel Libercci

Kim BleyKim Bley

Page 2: Operating Systems by Kim and Rachel

Unscramble the Following Unscramble the Following WordsWords

Computer Brand ScrambleComputer Brand Scramble

Page 3: Operating Systems by Kim and Rachel

Do you know of any operating Do you know of any operating systems?systems?

Page 4: Operating Systems by Kim and Rachel

What is an Operating What is an Operating SystemSystem

““An operating system, or OS, is a An operating system, or OS, is a software program that enables the software program that enables the computer hardware to communicate computer hardware to communicate and operate with the computer and operate with the computer software. Without a computer operating software. Without a computer operating system, a computer would be useless.”system, a computer would be useless.”

http://www.computerhope.com/os.htm#02http://www.computerhope.com/os.htm#02

Page 5: Operating Systems by Kim and Rachel

UnixUnix Created by AT&T’s Bell Laboratories in 1969 by Created by AT&T’s Bell Laboratories in 1969 by

Ken Thompson, Dennis Richie, and othersKen Thompson, Dennis Richie, and others First edition released in 1971First edition released in 1971

Included over 60 commands (Oooh Aaah)Included over 60 commands (Oooh Aaah) Quickly adopted and manufactured to suit various Quickly adopted and manufactured to suit various

needsneeds Government Government Academic InstitutionsAcademic Institutions

Unix alone is now an endangered speciesUnix alone is now an endangered species Unix-like systems still existUnix-like systems still exist

http://research.microsoft.com/en-us/um/people/gbell/digital/timeline/photos/unix2.jpg

Page 6: Operating Systems by Kim and Rachel

Apple/Macintosh Apple/Macintosh HistoryHistory

Apple Computers founded by Stephen Wozniak Apple Computers founded by Stephen Wozniak (remember Dancing with the Stars- Season 8), (remember Dancing with the Stars- Season 8), Steven Jobs and Ronald Wayne in 1976.Steven Jobs and Ronald Wayne in 1976.

They produced their first computer, the single-They produced their first computer, the single-board Apple I in 1976. After selling around 200 board Apple I in 1976. After selling around 200 computers, Jobs attracted the attention of some computers, Jobs attracted the attention of some investors, co-founding Apple Computer with investors, co-founding Apple Computer with Wozniak, and introducing the Apple II computer Wozniak, and introducing the Apple II computer in 1977. in 1977.

In 1984, Apple was the first company to mass In 1984, Apple was the first company to mass market the graphical user interface (GUI) in market the graphical user interface (GUI) in their Macintosh computer. This product re-their Macintosh computer. This product re-defined personal computing. defined personal computing.

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Page 7: Operating Systems by Kim and Rachel

Apple/Macintosh TimelineApple/Macintosh Timeline In June of 1978 Apple In June of 1978 Apple

introduces Apple DOS introduces Apple DOS 3.1, their first operating 3.1, their first operating system for Apple system for Apple ComputersComputers

System 1 in 1984.System 1 in 1984. System 2 in 1985.System 2 in 1985. System 3 in 1986.System 3 in 1986. System 4 in 1987.System 4 in 1987. System 6 in 1988.System 6 in 1988. System 7 in 1990.System 7 in 1990. Mac OS 8 in 1997.Mac OS 8 in 1997. Mac OS 9 in 1999.Mac OS 9 in 1999. Mac OS X 10.0 code Mac OS X 10.0 code

named Cheetah named Cheetah becomes available becomes available March 24, 2001.March 24, 2001.

Mac OS X 10.1 code Mac OS X 10.1 code named Puma and named Puma and becomes available on becomes available on September 25, 2001.September 25, 2001.

Mac OS X 10.2 code Mac OS X 10.2 code named Jaguar becomes named Jaguar becomes available on August 23, available on August 23, 2002.2002.

Mac OS X 10.3 code Mac OS X 10.3 code named Panther on named Panther on October 25, 2003.October 25, 2003.

Mac OS X 10.4 code Mac OS X 10.4 code named Tiger on June 28, named Tiger on June 28, 2004.2004.

Mac OS X 10.5 code Mac OS X 10.5 code named Leopard on named Leopard on October 26, 2007.October 26, 2007.

Mac OS X 10.6 code Mac OS X 10.6 code named Snow Leopard and named Snow Leopard and MobileMe on June 9, 2008.MobileMe on June 9, 2008.

Page 8: Operating Systems by Kim and Rachel

Why Mac?Why Mac?

Mac OS X Snow Leopard is the world’s Mac OS X Snow Leopard is the world’s most advanced operating system.most advanced operating system.

Built on an UNIX systemBuilt on an UNIX system Does not get PC virusesDoes not get PC viruses Compatible with the Windows Compatible with the Windows

NetworksNetworks Runs Microsoft WindowsRuns Microsoft Windows

Page 9: Operating Systems by Kim and Rachel

Microsoft Windows HistoryMicrosoft Windows History

Microsoft Windows was announced Microsoft Windows was announced November 10, 1983November 10, 1983

Bill Gates is the Founder of the Microsoft Bill Gates is the Founder of the Microsoft CorporationCorporation

Microsoft’s first operating system, Microsoft’s first operating system, Windows 1.0, was finally shipped on Windows 1.0, was finally shipped on November 20, 1985, almost two years November 20, 1985, almost two years past the initially promised release date. past the initially promised release date.

Page 10: Operating Systems by Kim and Rachel

Microsoft Windows TimelineMicrosoft Windows Timeline 1985 - 1985 - Windows 1.0Windows 1.0

Windows 1.0 used the MS-DOS Executive as its primary interface - you'd Windows 1.0 used the MS-DOS Executive as its primary interface - you'd boot programs from the command line, which would launch in the main boot programs from the command line, which would launch in the main window while MS-DOS Executive minimized itself, reappearing when the window while MS-DOS Executive minimized itself, reappearing when the program was terminated.program was terminated.

1987 - 1987 - Windows 2.0Windows 2.0The first Windows operating system that allowed you to 'tile' open The first Windows operating system that allowed you to 'tile' open windows, rather than having windows either minimized or maximized, like windows, rather than having windows either minimized or maximized, like in Windows 1.0.in Windows 1.0.

1990 - 1990 - Windows 3.0Windows 3.0The first Windows operating system to offer Desktop backgrounds and a The first Windows operating system to offer Desktop backgrounds and a Program Manager with quick-launch icons. Program Manager with quick-launch icons.

1993 - 1993 - Windows NT 3.1Windows NT 3.1NT, standing for New Technology, was a fully 32-bit operating system NT, standing for New Technology, was a fully 32-bit operating system (previous operating systems as well as future versions such as Windows (previous operating systems as well as future versions such as Windows 95 and 98 were 16-bit/32-bit hybrids). 95 and 98 were 16-bit/32-bit hybrids).

Page 11: Operating Systems by Kim and Rachel

Microsoft Windows TimelineMicrosoft Windows Timeline 1995 - 1995 - Windows 95Windows 95

The Taskbar was introduced for the first time in Windows 95, with open The Taskbar was introduced for the first time in Windows 95, with open window buttons, a clock, a notification area and the Start button. The My window buttons, a clock, a notification area and the Start button. The My Computer and Recycle Bin icons also appeared for the first time.Computer and Recycle Bin icons also appeared for the first time.

1996 - 1996 - Windows NT 4.0Windows NT 4.0This operating system looked very similar to Windows 95 but was focused This operating system looked very similar to Windows 95 but was focused more on the business market. It was stable and was able to close down more on the business market. It was stable and was able to close down applications that had stalled without the whole OS crashing. applications that had stalled without the whole OS crashing.

1998 - 1998 - Windows 98Windows 98This OS used the new naming system of using the year the product was This OS used the new naming system of using the year the product was released. Windows 98 was on sale for less than 12 months before a wide-released. Windows 98 was on sale for less than 12 months before a wide-ranging update for the OS was issued. One major bug in this OS was the ranging update for the OS was issued. One major bug in this OS was the computer would shut itself down if left on for 50 consecutive days.computer would shut itself down if left on for 50 consecutive days.

1999 - 1999 - Windows 98SEWindows 98SEThe updated version of Windows 98. The SE stood for Second Edition. It The updated version of Windows 98. The SE stood for Second Edition. It fixed many bugs in the original and improved support for the USB fixed many bugs in the original and improved support for the USB (universal serial bus). (universal serial bus).

Page 12: Operating Systems by Kim and Rachel

Microsoft Windows TimelineMicrosoft Windows Timeline 2000 - 2000 - Windows 2000Windows 2000

Another OS from the Windows NT family, Windows 2000 was aimed more at the Another OS from the Windows NT family, Windows 2000 was aimed more at the business market though it ended up on many home computers as well. It was business market though it ended up on many home computers as well. It was initially intended to replace both Windows NT 4.0 and Windows 98, but Microsoft initially intended to replace both Windows NT 4.0 and Windows 98, but Microsoft changed its mind after the release of Windows 98SE.changed its mind after the release of Windows 98SE.

2000 - 2000 - Windows MEWindows MEWindows Millennium Edition (ME, pronounced 'me') was the successor to Windows Windows Millennium Edition (ME, pronounced 'me') was the successor to Windows 98 and aimed very much at home users, with several entertainment-based features. 98 and aimed very much at home users, with several entertainment-based features. One magazine called it 'Windows Mistake Edition‘ because it was so unstable. One magazine called it 'Windows Mistake Edition‘ because it was so unstable.

2001 - 2001 - Windows XPWindows XPWindows XP was the successor to both Windows 2000 and Windows ME and offered Windows XP was the successor to both Windows 2000 and Windows ME and offered Home and Professional versions. Though it did suffer from several security Home and Professional versions. Though it did suffer from several security vulnerabilities, it stayed as Microsoft's main OS product for the best part of six years vulnerabilities, it stayed as Microsoft's main OS product for the best part of six years and had sold 400 million copies by October 2006. and had sold 400 million copies by October 2006.

2007 - 2007 - Windows VistaWindows VistaWindows Vista, with the exception of Windows ME, has become probably the worst Windows Vista, with the exception of Windows ME, has become probably the worst of all Microsoft's operating system, though the company points to sales figures that of all Microsoft's operating system, though the company points to sales figures that show it to be the most popular version to date. One of the main criticisms was of the show it to be the most popular version to date. One of the main criticisms was of the number of warning prompts the User Account Control (UAC) showed to users.number of warning prompts the User Account Control (UAC) showed to users.

Page 13: Operating Systems by Kim and Rachel

Microsoft Windows TimelineMicrosoft Windows Timeline Which brings us to….Which brings us to…. Windows 7 launched on 22 October 2009, Windows 7 launched on 22 October 2009,

bringing features such as support for bringing features such as support for touch screen devices and an easier touch screen devices and an easier home-networking set-up. According to home-networking set-up. According to Microsoft, Windows 7 is faster than its Microsoft, Windows 7 is faster than its predecessor, but will run on lower-spec predecessor, but will run on lower-spec PCs. So far, many people are liking PCs. So far, many people are liking Windows 7.Windows 7.

Page 14: Operating Systems by Kim and Rachel

Why Windows 7?Why Windows 7?

Faster loadingFaster loadingWindows 7 loads faster than Vista and XP. It will run quicker on a clean system since Windows 7 loads faster than Vista and XP. It will run quicker on a clean system since you have not cluttered it. On a regular computer it will run only marginally quicker you have not cluttered it. On a regular computer it will run only marginally quicker or even the same speed as Vista, although it does feel nippier thanks to its or even the same speed as Vista, although it does feel nippier thanks to its streamlined interface. streamlined interface.

Enhanced taskbarEnhanced taskbarIcon-only Taskbar- You just move the mouse over the icon and it will show you the Icon-only Taskbar- You just move the mouse over the icon and it will show you the windows you have.windows you have.

Improved UACImproved UACMicrosoft has listened to the various complaints leveled at Vista's UAC and, Microsoft has listened to the various complaints leveled at Vista's UAC and, although Windows 7 still has the feature, it's been toned down and made less although Windows 7 still has the feature, it's been toned down and made less annoying, with a choice of four user settings. At its most secure, it will prompt you annoying, with a choice of four user settings. At its most secure, it will prompt you when programs are installed or uninstalled, or you make any kind of system change. when programs are installed or uninstalled, or you make any kind of system change.

Touch screen technologyTouch screen technologyWindows Touch is easy to use and highly intuitive. Windows Touch is easy to use and highly intuitive.

Easier networkingEasier networkingWindows 7 automatically detects when you add a new computer and asks you if you Windows 7 automatically detects when you add a new computer and asks you if you want to make it part of your Home Group. Assuming you do, choose the libraries want to make it part of your Home Group. Assuming you do, choose the libraries and hardware you want to share, like your printer. All you need to do is enter the and hardware you want to share, like your printer. All you need to do is enter the password, and you're connected. password, and you're connected.

Page 15: Operating Systems by Kim and Rachel

Why Windows 7?Why Windows 7? Jump listsJump lists

The Jump List feature provides a simple way of getting to your favorite and recently The Jump List feature provides a simple way of getting to your favorite and recently used files. Just right-click the relevant program icon on the Taskbar (Word for used files. Just right-click the relevant program icon on the Taskbar (Word for example) and it will display a list of recently open files, along with any you've example) and it will display a list of recently open files, along with any you've chosen to pin to the menu. chosen to pin to the menu.

Desktop gadgetsDesktop gadgetsWindows 7 handles gadgets (Microsoft's name for widgets) similar to Vista except Windows 7 handles gadgets (Microsoft's name for widgets) similar to Vista except there's no sidebar. When you load a gadget it will just appear floating on your there's no sidebar. When you load a gadget it will just appear floating on your Desktop, you can move it anywhere. There are nine gadgets to choose from in the Desktop, you can move it anywhere. There are nine gadgets to choose from in the operating system, and plenty more available online from Windows Live Gallery.operating system, and plenty more available online from Windows Live Gallery.

Aero PeekAero PeekIf you want to just take a quick peek at your Desktop (to view a gadget for If you want to just take a quick peek at your Desktop (to view a gadget for example), use Aero Peek. Hover your mouse over the button and all the open example), use Aero Peek. Hover your mouse over the button and all the open windows will become transparent, allowing you to see right through them as if you'd windows will become transparent, allowing you to see right through them as if you'd suddenly acquired Superman-style X-ray vision. suddenly acquired Superman-style X-ray vision.

Aero ShakeAero ShakeWindows 7 has a cool way of quickly minimizing all but one of your open programs Windows 7 has a cool way of quickly minimizing all but one of your open programs and folders. Just click the title bar of any window you want to keep visible, and and folders. Just click the title bar of any window you want to keep visible, and shake it. Everything else will shrink down to the taskbar. To restore the closed shake it. Everything else will shrink down to the taskbar. To restore the closed items, shake the active window a second time.items, shake the active window a second time.

Aero SnapAero SnapDrag any open window to the left or right edge of your Desktop, and Windows 7 will Drag any open window to the left or right edge of your Desktop, and Windows 7 will resize it so the window takes up exactly half the screen. This makes it handy for resize it so the window takes up exactly half the screen. This makes it handy for comparing two similar pages side by side on a widescreen monitor. Pulling the comparing two similar pages side by side on a widescreen monitor. Pulling the window back to the centre will return it to its original size and shape. window back to the centre will return it to its original size and shape.

Page 16: Operating Systems by Kim and Rachel

Why Windows 7?Why Windows 7? Media streamingMedia streaming

Windows Media Player already lets you stream audio and video over a network. The Windows Media Player already lets you stream audio and video over a network. The version included in Windows 7 now lets you stream media over the internet. You version included in Windows 7 now lets you stream media over the internet. You just need to create or access a supported online ID, sp setup is very easy.just need to create or access a supported online ID, sp setup is very easy.

Enhanced PaintEnhanced PaintThe Windows 7 version of Paint sports a ribbon interface like the one used in The Windows 7 version of Paint sports a ribbon interface like the one used in Microsoft Office (WordPad also receives the same makeover), and a selection of Microsoft Office (WordPad also receives the same makeover), and a selection of artistic brushes that produce a more natural result. Use oils or watercolors for artistic brushes that produce a more natural result. Use oils or watercolors for example, and the paint quickly runs out, forcing you to click to reload the brush. example, and the paint quickly runs out, forcing you to click to reload the brush.

Better calculatorBetter calculatorWindows 7's calculator has standard, scientific, programmer, and statistic modes, Windows 7's calculator has standard, scientific, programmer, and statistic modes, history, digit grouping, unit conversion, and date calculation. It also offers history, digit grouping, unit conversion, and date calculation. It also offers worksheets which you can use to calculate personal items.worksheets which you can use to calculate personal items.

Tidy LibrariesTidy LibrariesLibraries are special virtual folders that tie together content from various sources, Libraries are special virtual folders that tie together content from various sources, like external drives and networked computers. The files remain where they are, but like external drives and networked computers. The files remain where they are, but can be accessed through the one location. You can use any of the ready-made can be accessed through the one location. You can use any of the ready-made libraries, or create your own. libraries, or create your own.

Page 17: Operating Systems by Kim and Rachel

LinuxLinux

Created by Linus Torvalds in 1991Created by Linus Torvalds in 1991 Designed to run on a home computerDesigned to run on a home computer Freely available over the internetFreely available over the internet Licensed under an open source agreementLicensed under an open source agreement

Anyone can use and/or modify the existing OS Anyone can use and/or modify the existing OS as long as it is freely sharedas long as it is freely shared

Little profit for Torvalds, mostly a Little profit for Torvalds, mostly a community of volunteers promoting his community of volunteers promoting his workwork http://http://www.linux.com/community/linuxwww.linux.com/community/linux-gurus/top-gurus-gurus/top-gurus

https://netfiles.uiuc.edu/rhasan/linux/Linus_Torvalds.jpg

Page 18: Operating Systems by Kim and Rachel

Linux DistributionsLinux Distributions

UbuntuUbuntu ($0) ($0) Download base OS, then download appsDownload base OS, then download apps Server download availableServer download available

Zorin OSZorin OS ($0 base, $12-$20 apps) ($0 base, $12-$20 apps) Base includes OpenOffice +, then donate or pay Base includes OpenOffice +, then donate or pay

money to get fancier apps (i.e. gaming package)money to get fancier apps (i.e. gaming package) Windows can run alongside or within ZorinWindows can run alongside or within Zorin

RedHatRedHat (from $80/year) (from $80/year) Price includes OpenOffice +, then various levels Price includes OpenOffice +, then various levels

of customer supportof customer support More here: More here: http://http://www.linux.comwww.linux.com/directory/Distributions/directory/Distributions

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Page 19: Operating Systems by Kim and Rachel

Why Linux?Why Linux?

Low to no costLow to no cost

Frequent updatesFrequent updates

Bugs can be fixed more quicklyBugs can be fixed more quickly

You can become a Linux Guru!You can become a Linux Guru!

http://www.technudgelive.com/linux/wp-content/uploads/2007/09/tux.jpg

Page 21: Operating Systems by Kim and Rachel

OS Usage: April 2010OS Usage: April 2010

http://marketshare.hitslink.com/operating-system-market-share.aspx?qprid=10&qptimeframe=M

Page 22: Operating Systems by Kim and Rachel

Match the Mac screenshot to it release Match the Mac screenshot to it release date.date.

1984 1990 1999 2008

Screenshots from:http://www.operating-system.org/betriebssystem/_english/bs-macos.htm#01 and http://news.softpedia.com/images/news2/New-Mac-OS-X-10-6-Snow-Leopard-Finds-Screenshots-2.png

Page 23: Operating Systems by Kim and Rachel

Match the MS screenshot to it release Match the MS screenshot to it release date.date.

1985 1995 2001 2009

Screenshots from: http://www.wired.com/gadgets/pcs/multimedia/2007/01/wiredphotos31?slide=12&slideView=4

Page 24: Operating Systems by Kim and Rachel

Survey Time!

Page 25: Operating Systems by Kim and Rachel

Resource ListResource ListApple - Get a Mac - Why you'll love a Mac. (n.d.). Apple - Get a Mac - Why you'll love a Mac. (n.d.). AppleApple. Retrieved May 18, 2010, from http://www.apple.com/getamac/whymac/. Retrieved May 18, 2010, from http://www.apple.com/getamac/whymac/

Apple Macintosh Operating System history.. (n.d.). Apple Macintosh Operating System history.. (n.d.). Computer Hope's free computer helpComputer Hope's free computer help . Retrieved May 18, 2010, from . Retrieved May 18, 2010, from

http://www.computerhope.com/history/macos.htmhttp://www.computerhope.com/history/macos.htm

Bellis, M. (n.d.). The Unusual History of Microsoft Windows. Bellis, M. (n.d.). The Unusual History of Microsoft Windows. InventorsInventors. Retrieved May 18, 2010, from . Retrieved May 18, 2010, from

http://inventors.about.com/od/mstartinventions/a/Windows.htmhttp://inventors.about.com/od/mstartinventions/a/Windows.htm

Booth, D. (2009, October 21). Windows 7 - best new feature: 14 reasons to upgrade. Booth, D. (2009, October 21). Windows 7 - best new feature: 14 reasons to upgrade. Web User magazineWeb User magazine. Retrieved May 18, 2010, from . Retrieved May 18, 2010, from

http://www.webuser.co.uk/specials/427554/windows-7-best-new-featureshttp://www.webuser.co.uk/specials/427554/windows-7-best-new-features

Camm-Jones, B. (2009, October 19). Microsoft Windows history - a timeline of the operating system. Camm-Jones, B. (2009, October 19). Microsoft Windows history - a timeline of the operating system. Web User magazineWeb User magazine. Retrieved May 18, 2010, from . Retrieved May 18, 2010, from

http://www.webuser.co.uk/news/in-depth/427212/windows-a-timeline-of-microsoft-s-oshttp://www.webuser.co.uk/news/in-depth/427212/windows-a-timeline-of-microsoft-s-os

Computer History Museum - Apple Computer, Inc. - Macintosh Selling Guide. (n.d.). Computer History Museum - Apple Computer, Inc. - Macintosh Selling Guide. (n.d.). Computer History MuseumComputer History Museum. Retrieved May 18, 2010, from . Retrieved May 18, 2010, from

http://www.computerhistory.org/brochures/companies.php?alpha=a-c&company=com-42b9d300137d4http://www.computerhistory.org/brochures/companies.php?alpha=a-c&company=com-42b9d300137d4

History of UNIX and Linux. (n.d.). History of UNIX and Linux. (n.d.). Computer Hope's free computer helpComputer Hope's free computer help . Retrieved May 18, 2010, from http://www.computerhope.com/history/unix.htm. Retrieved May 18, 2010, from http://www.computerhope.com/history/unix.htm

Microsoft Windows History. (n.d.). Microsoft Windows History. (n.d.). Computer Hope's free computer helpComputer Hope's free computer help . Retrieved May 18, 2010, from . Retrieved May 18, 2010, from

http://www.computerhope.com/history/windows.htmhttp://www.computerhope.com/history/windows.htm

Spicer, Dag. "Torvalds, Linus." Spicer, Dag. "Torvalds, Linus." World Book Student.World Book Student. World Book, 2010. Web. 17 May 2010. World Book, 2010. Web. 17 May 2010.

The Apple Museum | Before 1976. (n.d.). The Apple Museum | Before 1976. (n.d.). The Apple Museum | HomeThe Apple Museum | Home. Retrieved May 18, 2010, from http://www.theapplemuseum.com/index.php?id=54. Retrieved May 18, 2010, from http://www.theapplemuseum.com/index.php?id=54

The UNIX System -- History and Timeline -- UNIX History. (n.d.). The UNIX System -- History and Timeline -- UNIX History. (n.d.). The UNIX System, UNIX SystemThe UNIX System, UNIX System. Retrieved May 18, 2010, from . Retrieved May 18, 2010, from

http://www.unix.org/what_is_unix/history_timeline.htmlhttp://www.unix.org/what_is_unix/history_timeline.html

Unix - Wikipedia, the free encyclopedia. (n.d.). Unix - Wikipedia, the free encyclopedia. (n.d.). Wikipedia, the free encyclopediaWikipedia, the free encyclopedia. Retrieved May 18, 2010, from http://en.wikipedia.org/wiki/Unix. Retrieved May 18, 2010, from http://en.wikipedia.org/wiki/Unix

Welcome to Discovery Education's Puzzlemaker! Create your own Double Puzzle online now.. (n.d.). Welcome to Discovery Education's Puzzlemaker! Create your own Double Puzzle online now.. (n.d.). Welcome to Discovery Education's Puzzlemaker! Welcome to Discovery Education's Puzzlemaker!

Create crossword puzzles, word searches, mazes, and other puzzles for your classroom today!Create crossword puzzles, word searches, mazes, and other puzzles for your classroom today! . Retrieved May 18, 2010, from . Retrieved May 18, 2010, from

http://puzzlemaker.discoveryeducation.com/DoublePuzzleSetupForm.asphttp://puzzlemaker.discoveryeducation.com/DoublePuzzleSetupForm.asp


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