There is an interesting phenomenon that travellers usually put the local museums on their must-to visit list. The purpose of visiting museums for different are different,but something in common. We are curious about the cultural relics which had changed the civilization long time ago. I once visited the biggest museum in Xi'an. When I saw some pieces of coloured glaze brought from ancient Persia 1500 years ago, I imagined whether people who living in that period using glasses to make tea. When I saw some knife-shaped rock was uesd to cut meat thousands years ago, I could feel the decision from ancient people for changing the wrold. Though comparing to the internet, that "rock" looks very simply, in that period,it definitely pushed the civilization to get to a high level which just like what the internet did in the past 30 years. So, different periods have their own greatest inventions. The rock, the glass...... the interest, what's the next great invention? Will we live on other planets the nextfew decades? Let's create and witness!