Source: People’s Network
[The door has grown up, you have to learn to close it yourself! ] #College boys invented automatic closing dormitory artifact#】Recently, the weather was cold and cooling, and a college boy invented #Automatic closing dormitory artifact # became popular! Whenever someone opens the door and comes back, there is no need to close the door manually, and the water bottle with the rope will rely on gravity to close the door. Later, the dormitory boy launched an enhanced version of the closed-door artifact.