
Tuberculosis, smallpox, SARS, and the common cold are all possible side effects of
bookcrossing -- a hip, new, media-invented trend wherein folks leave their recently read books lying about as gifts for like-minded strangers. Tech geeks (this means YOU, dear reader) can even
register their books online and then track their journeys from reader to reader, city to city, country to country. (Or you can always just check
the Center for Disease Control for recent outbreaks stemming from your region.)