Choose one facility which was not available twenty years ago and write a short description of how students in the past studied without that facility

Choose one facility which was not available twenty years ago and write a short description of how students in the past studied without that facility. 
(Projector,computer, ink, USB,library, laptop,pencil, mobile phone,fountain pen, ball-point pen) 
Khuyến khích bài tự làm(được chấm điểm cao,đánh giá 5 sao)