"The truth is that even big collections of ordinary books distort space, as can readily be proved by anyone who has been around a really old-fashioned secondhand bookshop, one that looks as though they were designed by M. Escher on a bad day and has more
stairways than storeys and those rows of shelves which end in little doors that are surely too small for a full-sized human to enter. The relevant equation is: Knowledge = power = energy = matter = mass; a good bookshop is just a genteel Black Hole that knows
how to read. "
Hi, and welcome! Check out the "How to BookCross" item under the "information" tab (or see it here: http://www.bookcrossing.com/howto ); that should get you started, but if you still have questions, feel free to browse this forum, and post a new question if you don't find an answer in other recent threads.