There are many inventions such as wheels, compasses, gunpowder, electricity, steam energy, airplanes,...
In my opinion, the laptop is the most useful invention. Nowadays, students are too familiar with a laptop, an essential facility in education. Both teachers and students use it for finding information, doing and checking assignments and doing the presentation. But can you imagine 20 years ago, a laptop was just a fantasy dream with the young? They never thought that their assignments could be done without writing and if there was something that they didn't understand, they had to find it in books but with the limited source. I feel thankful for being lucky enough to be born in modern life.
