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Boys are more likely than girls to report that they visit Facebook most often (45% of boys vs. 36% of girls). Girls are more likely than boys to say they use Instagram (23% of girls vs. 17% of boys) and Tumblr (6% of girls compared with less than 1% of boys).

As American teens adopt smartphones, they have a variety of methods for communication and sharing at their disposal. Texting is an especially important mode of communication for many teens. Some 88% of teens have or have access to cell phones or smartphones and 90% of those teens with phones exchange texts. A typical teen sends and receives 30 texts per day2

Teenage girls use social media sites and platforms — particularly visually-oriented ones — for sharing more than their male counterparts do. For their part, boys are more likely than girls to own gaming consoles and play video games.

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There are no statistics about how many Afghan girls masquerade as boys. But when asked, Afghans of several generations can often tell a story of a female relative, friend, neighbor or co-worker who grew up disguised as a boy. To those who know, these children are often referred to as neither “daughter” nor “son” in conversation, but as “bacha posh,” which literally means “dressed up as a boy” in Dari. Through dozens of interviews conducted over several months, where many people wanted to remain anonymous or to use only first names for fear of exposing their families, it was possible to trace a practice that has remained mostly obscured to outsiders. Yet it cuts across class, education, ethnicity and geography, and has endured even through Afghanistan’s many wars and governments.

There are no specific legal or religious proscriptions against the practice. In most cases, a return to womanhood takes place when the child enters puberty. The parents almost always make that decision.

A bacha posh can also more easily receive an education, work outside the home, even escort her sisters in public, allowing freedoms that are unheard of for girls in a society that strictly segregates men and women.

Scientists and development experts across the globe are racing to increase food production by 50 percent over the next two decades to feed the world’s growing population, yet many doubt their chances despite a broad consensus that enough land, water and expertise exist.

The number of hungry people in the world rose to 1.02 billion this year, or nearly one in seven people, according to the United Nations Food and Agriculture Organization, despite a 12-year concentrated effort to cut the number.

Agronomists and development experts who gathered in Rome last week generally agreed that the resources and technical knowledge were available to increase food production by 50 percent in 2030 and by 70 percent in 2050 — the amounts needed to feed a population expected to grow to 9.1 billion in 40 years.