On the other hand, though, air transportation is a victim of its own success and its future depends on its ability to react to changes in the world economy – the very changes it had helped bring about.
Through the political change it has helped catalyse, the same strategy played a vital role in the movements against apartheid and tobacco.
It's not clear yet how Eyjafjallajökull will play into, or be exploited in, the climate-change debate; it has helped melt a glacier, though, and flooded some bridges in Iceland.
This is a one-off solution, and not a long term macroeconomic change, but it has helped.
Among other provisions, the 1996 law expanded protections for people with serious medical conditions who change jobs, and it has helped millions of people, but millions more know nothing about it.
It is part of our DNA and we wouldn't change it because it has helped us both excel in our careers.
It's a lesson that's been learned yet again in the era of space travel, and it has helped change medical practice by encouraging an early return to physical activity after illness or surgery.
It has helped change medical practice by alerting doctors to the importance of asking about a patient's sexual orientation and sexual history, matters not previously part of routine patient-doctor discussions.
Few have taken it as an exact blueprint — the mix of things that make it work are hard to copy — but it has helped change the reputation of a city where a night on the town used to offer mostly the wrong kind of thrills.
The Legal Services Center — or, as Bellow had described it in the past, the "teaching law office" — is similar to the teaching hospital model used in medical schools across the country, including at Harvard, and it has helped change the lives of thousands of clients in Jamaica Plain, Roxbury, and other neighborhoods in Boston and beyond.
