EBooks

Hey.

Once in the subway such a picture.
Sitting next to a student and granny.
The student is well-groomed, fully clothed, glasses, on her lap a pink journal covers ... a stack of lectures. Papers of different formats are not amenable to order, stick out to the sides, crumble.
Granny is also traditional: a woolen shawl, a string bag. Only in the hands of a grandmother - a communicator!
The descendants, apparently, gave the classics reread.

Such a question on the topic)
Is anyone here downloading e-books?
I want to generate a small statistic: which formats are most in demand, from which devices it is more convenient to read.
Or maybe audiobooks? GDP here Klyuchevskogo history listens on the road))