if there is no eletricity in the world

I arrived the laboratory as usual yesterday morning and turn on the computer. I was wandering that what i can do today. I went to the internet. Suddenly the computer's screen was dark and lamps were dark too. The eletricity power was off. The whole building lost eletricity power. Suddenly it was very quiet in the room, there was no noise from the computer. Firstly i did not know what i can do without the computer. A few minutes later i realized that i feeled good without the computer and eletricity.
Mordern people have used to the mordern equipment such as computer, if there is no eletricity in the world what we can do or how are our life?