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Tião, like the other catadores profiled in the film, is far from an emaciated beggar living out a miserable existence on the way to an early death. But he is humble and has few expectations of earthly glory. Although a social outcast, he organized an association of pickers who live and work in Jardim Gramacho, one of the world’s largest garbage dumps, and likes to think of himself as an environmentalist.

The film — co-directed by João Jardim and Karen Harley, and photographed by Dudu Miranda — observes this giant landfill from every perspective.

Tião is the most prominently featured of several pickers profiled by the film. Their lives are changed forever when they are chosen to collaborate with the artist Vik Muniz, a São Paulo native who is now based in Brooklyn and is well known for his re-creations of famous artworks using unusual materials. Those pieces include two Mona Lisas — one made of peanut butter, the other of jelly — and a “Last Supper” made of chocolate syrup. For his Sugar Children series, he took snapshots of children on a plantation in St. Kitts and copied the images by layering sugar on black paper and photographing the result. The film observes the creation of his recent monumental series, Pictures of Garbage, for which Mr. Muniz, who grew up poor, returned to Brazil.

“A program officer from a foundation recently asked me, ‘Is the work you’re doing STEM education or science education?’ ” said Elizabeth Stage, the director of the Lawrence Hall of Science at the University of California, Berkeley. “I drew him a Venn diagram, showing him what’s central about science and how that overlaps with technology, engineering and math.” Dr. Stage, a mathematician by training, thinks it’s a “false distinction” to “silo out” the different disciplines, and would much prefer to focus on what the fields have in common, like problem-solving, arguing from evidence and reconciling conflicting views. “That’s what we should have in the bulls’-eye of our target,” she said.

Yet others don’t frame the word “science” so narrowly, as the province of the given rather than of the forged. Science has always encompassed the applied and the basic, and the impulses to explore and to invent have always been linked. Galileo built a telescope and then trained it on the sky. Advances in technology illuminate realms beyond our born senses, and those insights in turn yield better scientific toys. Engineers use math and physics and the scientific mind-set in everything they design; and those who don’t, please let us know, so we can fly someone else’s airplane and not cross your bridge when we come to it. Whatever happened to the need for interdisciplinary thinking? Why promote a brand that codifies atomization? Besides, acronyms encourage rampant me-tooism. Mr. Dyak said that some have lobbied for the addition of medicine to the scholastic program, complete with a second M. “It’s called STEM squared,” he said. Even the arts are hankering for an orthographic position, he added. STEAM education: great books, labs and motherboards, and free rug cleaning, too.

intellectual humility

“They, instead, commit the fundamental attribution error, which is if something good happens, it’s because I’m a genius. If something bad happens, it’s because someone’s an idiot or I didn’t get the resources or the market moved.

. Your degree is not a proxy for your ability to do any job. The world only cares about — and pays off on — what you can do with what you know (and it doesn’t care how you learned it).

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.

Google disclosed Thursday that it continuously uses enough electricity to power 200,000 homes, but it says that in doing so, it also makes the planet greener

But when it calculates that average energy consumption on the level of a typical user the amount is small, about 180 watt-hours a month, or the equivalent of running a 60-watt light bulb for three hours

“When we hit the Google search button,” Mr. Horowitz said, “it’s not for free.