Boston—Harvard Business Review unveiled last week changes to its magazine and its Web site. The January-February issue of the magazine features a new logo, and the publication's table of contents no longer figures as prominently on the cover. Among the other changes to the magazine is a front of the book segment called "Defend Your Research," which takes a close and skeptical look at provocative new research. The revamped Web site at hbr.org launched last Thursday. "The Web site has been completely overhauled in a span of a year," Josh Macht, HBR's group publisher said.