Engineering and the City can and must work together, as another space-based example demonstrates.

BBC: For economic inspiration, look to space

This example demonstrates how effective leaders in public service can positively change the lives of those they serve.

WHITEHOUSE: Vision, Leadership, and Innovation: Our Path Forward in the 21st Century | The White House

This dad and daughter example demonstrates that how you design your exit plan determines how much you retain for your efforts.

FORBES: Exiting The Family Business: Tax Tips And Techniques

This example demonstrates the potential for confusion when dealing with percentage changes.

ECONOMIST: The perils of percentages

But rail is a powerful example because it demonstrates exactly how this bias for high-profile triumphal projects causes people to miss the obvious.

FORBES: Shifting Capital From the Productive to the Sexy

The French revolution provides an example, but also demonstrates the authors' unfortunate habit of ignoring historical detail.

ECONOMIST: Creating economic wealth

However, as the example of Mexico's immigrants demonstrates, the tougher border controls become, the less likely migrants are to go home when their work is done, and to incur the expense and danger of another crossing.

ECONOMIST: Managing the market

It is an example other oil producers should follow and demonstrates that a post-2012 treaty is an opportunity for oil producers, not a threat as some currently perceive.

BBC: Low-carbon economy is not a luxury

For example, work in the field of epigenetics demonstrates that environment can have a profound influence on how DNA impacts biology.

FORBES: Do Liars Really Have Different Brains?