If you use Google services such as Google Reader, Google Drive, YouTube, Contacts, Google+ Circles, Latitude, Picasa Web Albums and a few more, you can download all of your stuff to your computer.
A Black hole is a place in space where gravity pulls so much that even light can not get out. They are one of the greatest mysteries in space. Take this quiz adn find out how much do you really know about Black holes!
To ensure the authenticity of a document you have to sign the document with the certificate. I will show you how you can easily sign PDF document with the help of simple tool DigiSigner.