My post below on the advantages of a digital life concentrated on how content simplifies some physical aspects of travel. But here are two other advantages:

1. Many researchers put preprint versions of their books online for free, so even impecunious students and interested researchers without NSF grants can have them.

2. As one ages, one’s eyes become less forgiving of small type. That’s what zooming is for:

Images are from Johan van Benthem’s Modal logic for open minds, which costs $30 on Amazon but is freely available online in preprint form.

(All the administrative detritus on the screenshots above is to illustrate navigation; iBooks — and other content consumption apps — is pretty good at keeping all this detritus as unobtrusive as possible and out of the screen in general.)