The most difficult things to X ray, the most technically challenging things to X ray are the lightest things, the most delicate things.

As the surface of the ocean gets warmer, the water is lighter when it's warmer, it becomes harder and harder to turn the ocean over.

Europe is currently facing its most challenging crisis of the postwar period. After six quarters of recession, the slump is spreading to the eurozone s core countries.

Now I defy you to come up with any other physical activity and please don't say golf something that actually is hard where geriatrics are performing as well as they did as teenagers.

NEW DELHI One of the more difficult questions I found myself being asked when I was a United Nations under secretary general, especially when addressing a general audience, was What is the single most important thing that can be done to improve the world?

So let me conclude then by saying that in the last 35 years, as I've worked in some of the most dangerous, difficult and intractable conflicts around the planet, I have yet to see one conflict that I felt could not be transformed.

We banned those chemicals, and we replaced them, unknowingly, with other substances that, molecule per molecule, are a hundred times more potent as heat trapping, greenhouse gases than carbon dioxide.

That if I land this client once, and every week I get paid by that person, that's way better than trying to sell one clothespin thing to one person.

The truth is that we have already exhausted so much of the easily accessible fossil fuels that we have already entered a far riskier business era, the era of extreme energy.

Denial of gay couples legal right to call themselves married is has become intolerably discriminatory. But allowing them to marry has proved a harder legislative nut to crack than allowing them civil partnerships.