As for e-book sales, Amazon did say earlier this summer that it sells 143 e-books for every 100 hardcover books (Of course, e-books are much cheaper than hardcover).

FORBES: Majority Of Adults Not Into E-Readers?

Topol makes his case in a new book, The Creative Destruction of Medicine: How the Digital Revolution Will Create Better Health Care, released as an eBook today and scheduled for hardcover release from Basic Books in January.

FORBES: How Smartphone Apps and Social Networks Will Revolutionize Medicine

Amazon announced last week that for every 100 printed books (hardcover and paperback) sold since April 1, it has sold 105 Kindle eBooks.

FORBES: Print And eBook: Two Formats, One Book Lover