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How PhET interactive simulations tool helps in building the knowledge of basic science in students

PhET Interactive Simulations,  a project at the  University of Colorado Boulder , is a non-profit [1]   open educational resource  (OER) project founded in 2002 by  Nobel  Laureate  Carl Wieman . PhET began with Wieman’s vision to improve the way science is taught and learned. Their stated mission is "To advance science and math literacy and education worldwide through free interactive simulations." PhET provides fun, free, interactive, research-based science and mathematics simulations. These tests include student interviews and observation of simulation use in classrooms. The simulations are written in Java, Flash or HTML5, and can be run online or downloaded to your computer. All simulations are open source  Following video  explains what is PhET. The PhET simulation software is available for Windows, Linux and Mac platforms. The PhET simulators for the appropriate platforms can be downloaded from here . 

How to Disable System Integrity Protection(SIP) or rootless mode in OS X El Capitan.

System Integrity Protection  or Rootless mode is a security feature of OS X El Capitan operating system  by Apple Inc. It protects certain system processes, file and folders from being modified or tampered with by other processes even when executed by the root user or by a user with root privileges(sudo). Following are the  the key concepts of System Integrity Protection. 1. System Locations Cannot Be Written To  -  System files can be modified only by system processes signed with Apple’s code signing identity. App processes should instead write to locations designated for third-party developers. The following directories can only be written to by the system:  System-Only Locations      ● /bin      ● /sbin      ● /usr      ● /System  In contrast, the following directories are available to any process:  Locations Available to Developers    ...

How to change the default font in Outlook for Mac 2016 on OS X.

It very easy to change the font style in outlook for Mac 2016 on OS X. Follow below steps to change the default font. Open "Outlook"  application on Mac. Open Preferences of Outlook       3. Click on Fonts to change the default font settings for the outlook.            4. Select the desired font to set as default font.      5. Close the preferences window.      6. Click on New Email, Now your default font would set to the newly configured font style.

plutil - a very usefull command line tool on mac to edit encoded plist files

plutil - is a very useful tool to decode and encode the plist files on OSX system. The tool can be used decode the plist file to human readable format in Terminal which would help user to edit the plist files in terminal using vim or nano etc. plutil -convert xml1 [path_to_the_plist_file] The above command will decode the plist file to a readable xml format in command line. plutil -convert binary1 [path_to_the_plist_file] The above command can be used encode back the file to original binary format from command line.

How to add tab completion in Apple OS X

Tab completion in Linux is a very useful feature. On OS X the tab completion can be enabled as well. The tab completion can be enabled on OS X by adding few lines to .inputrc file. Method: Open Terminal.app Go to your home directory such as  /Users/user. Open vim to create .inputrc file in home directory by running following command. vim .inputrc Add following lines to the file set completion-ignore-case on set show-all-if-ambiguous on TAB: menu-complete Save the file using "esc + :wq" in vim. Now open another tab to see the changes to tab completion in bash shell.

Why and how we can bypass restricted paid WiFi's at public places such as airports, etc ?

            We might be wondering some times on how to bypass the restricted paid wifi in public places to access particular URL . To bypass some poorly configured WiFi's just append (without the double quotes)   " ?.jpg  " to end of your URL string. This should work in many instances where generally blocker is configured let images through.  Appending ?.jpg to the URL makes the blocker think that the URL is an image. On the other hand, anything after the ? doesn't change the actual webpage requested, it only changes the GET headers. (so http://google.com/?.jpg and http://google.com/ give the same page). Note that if there already is a query string in the URL (something after a question mark), then you must use &.jpg instead of ?.jpg , as only the first question mark is considered for making a query string HTH