A Crack in Everything explores the fascinating breakthroughs that led to the discovery of black holes, the scientific enigma that could unlock the answers to mankind’s most profound questions about the universe.

For fans of Good to Great and The First 90 Days, The Four Disciplines of Execution is the book “every leader should read” (Clayton Christensen, Professor, Harvard Business School, and author of The Innovator’s Dilemma) for creating lasting organizational change. A #1 Wall Street Journal bestseller with more than 500,000 copies sold, The Four Disciplines of Execution will radically change your business.

4DX® is not theory. It is a proven set of practices that repr...