I started to learn Greek when I was in high school, the last year of high school, by accident, because my teacher knew Greek and she offered to teach me on the lunch hour, so we did it in an informal way, and then I did it at university, and that was the main thing of my life.

My grandmother was a kind of Scarsdale, New York, society woman, best known in her day as the author of the 1959 book 'Growing Your Own Way: An Informal Guide for Teen-Agers' - this despite being a person whose parenting style made Joan Crawford's wire hangers look like pool noodles.

I would like to make sure, first of all, that our women in the informal sector - I mean, these are the farmers and the traders; many of them are not educated, many of them lacking literacy - be able to give them better working conditions. And we've done a lot to be able to achieve that.

I just find that people can waste a lot of time in meetings, so I try to restrict meetings to the minimum that they need to be. But I have lots of time in my day where I am available to have informal conversations, where I grab someone to talk, and people can just walk up to my desk and talk to me.

Sometimes our definitions fall short. Take, for example, the way we view income and labor. It simply doesn't cover enough of the work that women, and in particular poor women, are doing - especially in their own households and the vast 'informal' economy in which most of the world's poorest people work.

Brandeis is so fast and loose and informal, I didn't have any problem offering a history course as a biologist. The barriers would be far more formidable, unscalable, at other institutions. But this is a user-friendly place. It's 'Shmedrik University' - that's a Yiddish word for even worse than schlemiel.

On the simplest level, telecommuting makes it harder for people to have the kinds of informal interactions that are crucial to the way knowledge moves through an organization. The role that hallway chat plays in driving new ideas has become a cliche of business writing, but that doesn't make it less true.

Square is turning informal, cash transactions, like you would do with a taco truck, into card swipes. Stripe is more for the Internet, it's focused on the kinds of transactions that weren't possible years ago. We think about how you would buy things from a mobile phone, crowd-funding, how should that work.

When I took part in European leaders summits, it was sometimes unpleasant for me to hear Romanian, Polish, Portuguese, and Italian friends speak English, although I admit that on an informal basis, first contacts can be made in this language. Nevertheless, I will defend everywhere the use of the French language.

Of course, when people work together, there can be tension and disagreement. But policing informal behavior makes it hard for people to speak freely for fear they will say the wrong thing. Even self-aware individuals can doubt their judgement and start to rely on the diversity trainer to judge if something is offensive.

When I had photographed Prince William's mother, I brought along a CD of Dalida, a French singer, that we played on set all day to relax everyone. I decided to do the same thing for Catherine and William. The contrast of the contemporary informal music playing in the beautiful rooms with so much history caused a lot of laughter.

During a large disaster, like Hurricane Katrina, warnings get hopelessly jumbled. The truth is that, for warnings to work, it's not enough for them to be delivered. They must also overcome that human tendency to pause; they must trigger a series of effective actions, mobilizing the informal networks that we depend on in a crisis.

'Royal Beatings' was my first story, and it was published in 1977. But I sent all my early stories to 'The New Yorker' in the 1950s, and then I stopped sending for a long time and sent only to magazines in Canada. 'The New Yorker' sent me nice notes, though - penciled, informal messages. They never signed them. They weren't terribly encouraging.

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