There is an interesting phenomenon that travelers usually put local museums on their must visit list. The purposes of visiting museums are different, but have something in common. We are curious about the cultural relics which changed civilization a 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 living in that period used glasses to drink tea. When I saw that some knife-shaped rocks were used to cut meat thousands of years ago, I could imagine the decision of ancient people to change their world. Though compared to the internet, that "rock" looks very simple, in that period, it definitely pushed civilization to improve which is just like what the internet has done in the past 30 years. So, different periods have their own greatest inventions. The rock, the glass, the internet, what's the next great invention? Will we live on other planets within the next few decades? Let's create and witness!