This continually updated and stunningly informative resource from the National Center for Biotechnology Information (NCBI) offers readers free online access to entire books and a host of articles, workshop summaries, and other documents concerned with the life sciences and health care. Readers may like to scan the Quick Start Guide, which explains how to browse titles, search across content, and offers some helpful search tips. Also on the landing page, readers will find a New & Updated section and a Featured Titles section, both of which offer insights into the depths of the information available on the Bookshelf. The meat of the site can be accessed through the search engine. For instance, searching "pancreatic cancer" returns 2,608 items, 395 of which are freely accessible books.