Use your mobile phone now! Get a free QR-Code Scanner (examples: Blitz QR Scanner, Kostenloser QR Scanner,...) and scan the following code. You're going to be directly conntected to another programme, called PADLET. Your teacher has already started some entries. You should not only try to comment on these existing ones but you should also add your own entries. Show what you know! If possible, include nice pictures as well.