5 . A few years ago, a young woman at Facebook came to my desk and asked if she could speak privately. We headed into a conference room, where she began firing off questions about how I balance work and family. As the questions came faster and faster, I started to wonder about her urgency. I interrupted to ask if she had a child. She said no, but she liked to plan ahead. I inquired if she and her partner were considering having a child. She replied that she did not have a husband, then added with a little laugh, “Actually, I don’t even have a boyfriend.”

It seemed to me that she was jumping the gun but I understood why. From an early age, girls get the message that they will have to choose between succeeding at work and being a good mother. By the time they are in college, women are already thinking about the trade-offs they will make between professional and personal goals! When asked to choose between marriage and career, female college students are twice as likely to choose marriage as their male classmates. And this concern can start even younger. Peggy Orenstein, the author of Cinderella Ate My Daughter, related the story of a five-year-old girl who came home distraught from her after-school program and told her mother that both she and the boy she had a crush on wanted to be astronauts.When her mother asked why that was a problem, the little girl replied, “When we go into space together,who will watch out kids?” At five,she thought the most challenging aspect of space travel would be dependable childcare.

As I’ve mentioned, I’m a big believe in thoughtful preparation. Everywhere I go, I carry a little notebook with my to-do list. But when it comes to integrating career and family, planning too far in advance can close doors rather than open them. I have seen this happen over and over. Women rarely make one big decision to leave the workforce. Instead, they make a lot of small decision along the way, making accommodations and sacrifices that they believe will be required to have a family. Of all the ways women hold themselves back, perhaps the most pervasive is that they leave before they leave.

6 . The concept of planning entire communities before their construction is an ancient one. In fact, one of the earliest such cities on record is Miletus, Greece, which was built in the 4th century BC. Throughout the Middle Ages and the Renaissance various planned communities (both theoretical and actual) were conceived (构思). Leonardo da Vinci designed several cities that were never constructed. Following the Great Fire of London in 1666, the architect Christopher Wren created a new master plan for the city, combining park land and urban space. Several 18th century cities, including Washington D.C., New York City, and St Petersburg, Russia, were built according to comprehensive planning.

One of the most important planned city concepts, the Garden City Movement, arose in the latter part of the 19th century as a reaction to the pollution and crowding of the Industrial Revolution. In 1898, Ebenezer Howard published the book To-Morrow: A Peaceful Path for Real Reform in which he laid out his ideas concerning the creation of new economically sustainable towns. Howard believed that these towns should be limited in size and density, and surrounded with a belt of undeveloped land. The idea gained enough attention and financial backing to lead to the creation of Letchworth, in Hertfordshire, England. This was the first such 'Garden City'. After the First World War, the second town built following Howard's ideas, Welwvn Garden City, was constructed.

In the early 1920s, American architects Clarence Stein and Henry Wright, inspired by Howard's ideas and the success of Letchworth and Welwyn, created the city of Radbum, New Jersey. Conceived as a community which would be safe for children, Radbum was intentionally designed so that the residents would not require automobiles. Several urban planning designs were pioneered at Radbum that would influence later planned communities, including the separation of pedestrians and vehicles, and the use of 'superblocks', each of which shared 23 acres of commonly held parkland.

In America, following the stock market crash of 1929, there was great demand for both affordable housing and employment for workers who had lost their jobs. In direct response to this, in 1935 President Roosevelt created the Resettlement Administration, which brought about a total of three greenbelt towns: Greenbelt, Maryland; Greenhills, Ohio; and Greendale, Wisconsin. These towns contained many of the elements of the Garden City Movement developments, including the use of superblocks and a 'green belt' of undeveloped land surrounding the community.