Once, I thought that paper was the greatest invention throughout the whole history of human beings. It could be used to record the events and great thoughts in the history. We realized the ancient society by reading the words written on papers, but everything changed since the technology developed into a high level. Today, we are told not to use more papers in offices, because that only a finger nail size chip can store information as much as the amount of information all the books recorded in the past thousands years. It's very convenient! Additionally, a paperless society can protect our environment by cutting less trees. So, I think that chip maybe the greatest invention in the history. I don't know how excited the people were when they used papers for writting 2,000 years ago. Did they predict that paper can also be replaced by oithe things one day? So,will chips be replaced by other things in the furture? What will be hold in our hand? cell phones? What will be the next great invention? No matter, how the society develops, only two things have to be done during everyone's daily life, sleeping and eating. Bed and food are definitely the greatest invention in the history!