QR Codes

If you are here at this blog, then you don't really need to use the QR Code that is shown below:

A QR code is a type of bar code which can be scanned by a phone equipped with a (usually free) app.
Scanning the app will decode the pattern and reveal an image, or a piece of text (which could be a question) or provide the URL of a website which can then be visited using the smartphone's web browser.

This QR code could be printed out and placed in locations to suit you, and anyone scanning it would have the details of this blog... or it could be the homework....