Testing leads to failure, and failure leads to understanding.

We'll go back to the moon by not learning anything new.

Space travel is the only technology that is more dangerous and more expensive now than it was in its first year. Fifty years after Yuri Gagarin, the space shuttle ended up being more dangerous and more expensive to fly than those first throwaway rockets, even though large portions of it were reusable. It's absurd.

The photographs of space taken by our astronauts have been published all over the place. But the eye is a much more dynamic mechanism than any camera or pictures. It's a more exciting view in person than looking at the photographs. Of course, I personally am sick and tired of hearing people talk like that: I want to see it myself!

By 1973, we had a space station, the Skylab, and we had multiple probes going up to planets. So, all this wonderful stuff happened in 10 to 15 years. About that time, there should have been enormous initiatives to make it affordable for people to fly in space, not just a handful of trained NASA astronauts and Russian cosmonauts.

Computers are very expensive and they need power, and that can be a problem in Africa.

If economic progress is not translated into better quality of life and respect for citizens' rights, we will witness more Tahrir Squares in Africa.

Governance has been at the heart of the work of the Oxford Martin Commission for Future Generations and is a clear focus in its report, 'Now for the Long Term.'

Rule of law is the most important element in any civil society.

There is a crisis of leadership and governance in Africa, and we must face it.

For citizens to become fully engaged in holding their leadership to account, accurate information is required to see where action is needed, to measure the results of policies and programmes, to build support for courageous decisions and to consolidate political legitimacy.

The Nobel Prize is worth $1.5 million, but that's not the issue. Do the distinguished scientists who win the Nobel Prize need the money? Probably not. The honor is more important the money, and that's the case with the prize for African leadership as well.

Botswana had three successive good presidents who served their legal terms, who did well for their countries - three, not one.

More people smile at me now I'm richer.

By the end of 1978, we had 11 partners and six franchisees, we were operating in 22 cities, and we had about 6,000 clients. We had left Electronic Accounting Systems and were doing our own processing on our own computers.

I love New York. But how much should it cost to call New York home? Decades of out-of-control budgets, spending hikes, and relentless borrowing have made New York simply too expensive.

Kids are finding out about the potential for discovery online from other sources; many of them have computers at home, for instance, or their friends have them.

Technology will eventually destroy the way schools are run now.

Some go on to trade schools or get further training for jobs they are interested in. Some go into the arts, some are craftsmen, some take a little time out to travel, and some start their own businesses. But our graduates find and work at what they want to do.

You can't trust the internet.

In the practical world of computing, it is rather uncommon that a program, once it performs correctly and satisfactorily, remains unchanged forever.

My being a teacher had a decisive influence on making language and systems as simple as possible so that in my teaching, I could concentrate on the essential issues of programming rather than on details of language and notation.

My duty as a teacher is to train, educate future programmers.

But active programming consists of the design of new programs, rather than contemplation of old programs.

Clearly, programming courses should teach methods of design and construction, and the selected examples should be such that a gradual development can be nicely demonstrated.

A good designer must rely on experience, on precise, logic thinking; and on pedantic exactness. No magic will do.

If computers remain far worse than us at image recognition, a certain over-confident combination of man and machine can elsewhere take inaccuracy to a whole new level.

Forget artificial intelligence - in the brave new world of big data, it's artificial idiocy we should be looking out for.

Over tens and hundreds of thousands of years, we evolved to find certain things stimulating, and as very intelligent, civilized beings, we're enormously stimulated by problem solving and learning.

Companies are accustomed to dismissing employees for misuse of computers at work.

Federal regulations forbid delaying inspections for fracture-critical bridges like the fallen Minneapolis bridge - the kind with a lack of redundancy in design, so that a single failure in a load-bearing part can cause the entire bridge to collapse.

Some parents believe that competition helps prepare children to succeed. Others fear that their children will not be able to handle failure.

Disclosure of private e-mails from government officials has been a legal issue in many states.

The technological revolution at home makes it much easier for computers to do our work.

What we see today is an American economy that has boomed because of policies and developments of the 1950s and '60s: the interstate-highway system, massive funding for science and technology, a public-education system that was the envy of the world and generous immigration policies.

The Berlin Wall wasn't the only barrier to fall after the collapse of the Soviet Union and the end of the Cold War. Traditional barriers to the flow of money, trade, people and ideas also fell.

The American dream seems to be thriving in Europe not at home.

I got up with my wife, I sat down at the computer when she went to work, and I didn't stop until she got home.

Modern people are only willing to believe in their computers, while I believe in myself.

I enjoy every climb - maybe it's because it's a literal dance between life and death.

We set ourselves limits, but we are all strong enough to aim higher, to achieve our goals. All we have to do is find such strength within ourselves. Know how to develop it.

The idea that so many kids eat rubbish and sit on computers all day long appals me and getting them into sport is a major way of getting them off computers and leading healthier lives.

I love animals and feel very strongly that people should not be allowed to buy a pet if they are not able to look after it.

Every company that made computers when we started the Mac, they're all gone.

Economics pretends to be a science. Its practitioners fill blackboards with equations and clog computers with data. But it is really a faith, or more accurately a set of overlapping and squabbling faiths, each with its own doctrines.

Big banks have long had private equity divisions that put up capital for deals too complex or risky for individual shareholders to finance.

To finance deficits, the government must sell bonds to investors, competing for capital that could otherwise be used to invest in stocks or corporate bonds. Government borrowings raise long-term interest rates, stifling economic growth.

African runners regularly work out in the United States and Europe, and the International Olympic Committee sends some of the cash from the Games to Olympic committees in poor nations, which use the money to finance their own programs.

Like many other banks and finance companies, Green Tree used a process called securitization to resell its home loans to outside investors. Green Tree grouped thousands of these small loans into a pool worth hundreds of millions of dollars.

Information technology departments must spend enormous amounts of time and money worrying about integrating big computer systems with billions of pieces of customer data.