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Archaeologists are still excavating Göbekli Tepe and debating its meaning. What they do know is that the site is the most significant in a volley of unexpected findings that have overturned earlier ideas about our species' deep past. Just 20 years ago most researchers believed they knew the time, place, and rough sequence of the Neolithic Revolution—the critical transition that resulted in the birth of agriculture, taking Homo sapiens from scattered groups of hunter-gatherers to farming villages and from there to technologically sophisticated societies with great temples and towers and kings and priests who directed the labor of their subjects and recorded their feats in written form. But in recent years multiple new discoveries, Göbekli Tepe preeminent among them, have begun forcing archaeologists to reconsider. At first the Neolithic Revolution was viewed as a single event—a sudden flash of genius—that occurred in a single location, Mesopotamia, between the Tigris and Euphrates Rivers in what is now southern Iraq, then spread to India, Europe, and beyond. Most archaeologists believed this sudden blossoming of civilization was driven largely by environmental changes: a gradual warming as the Ice Age ended that allowed some people to begin cultivating plants and herding animals in abundance. The new research suggests that the "revolution" was actually carried out by many hands across a huge area and over thousands of years. And it may have been driven not by the environment but by something else entirely.

Most of the world's great religious centers, past and present, have been destinations for pilgrimages

Göbekli Tepe may be the first of all of them, the beginning of a pattern. What it suggests, at least to the archaeologists working there, is that the human sense of the sacred—and the human love of a good spectacle—may have given rise to civilization itself.

n the 1960s archaeologists from the University of Chicago had surveyed the region and concluded that Göbekli Tepe was of little interest. Disturbance was evident at the top of the hill, but they attributed it to the activities of a Byzantine-era military outpo

To Schmidt, the T-shaped pillars are stylized human beings, an idea bolstered by the carved arms that angle from the "shoulders" of some pillars, hands reaching toward their loincloth-draped bellies. The stones face the center of the circle—as at "a meeting or dance," Schmidt says—a representation, perhaps, of a religious ritual. As for the prancing, leaping animals on the figures, he noted that they are mostly deadly creatures: stinging scorpions, charging boars, ferocious lions. The figures represented by the pillars may be guarded by them, or appeasing them, or incorporating them as totems.

nches below the surface the team struck an elaborately fashioned stone. Then another, and another—a ring of standing pillars.

Geomagnetic surveys in 2003 revealed at least 20 rings piled together, higgledy-piggledy, under the earth.

he pillars were big—the tallest are 18 feet in height and weigh 16 tons. Swarming over their surfaces was a menagerie of animal bas-reliefs, each in a different style, some roughly rendered, a few as refined and symbolic as Byzantine art.

The circles follow a common design. All are made from limestone pillars shaped like giant spikes or capital T's.

They hadn't yet mastered engineering." Knoll speculated that the pillars may have been propped up, perhaps by wooden posts.

Within minutes of getting there," Schmidt says, he realized that he was looking at a place where scores or even hundreds of people had worked in millennia past.

Puzzle piled upon puzzle as the excavation continued. For reasons yet unknown, the rings at Göbekli Tepe seem to have regularly lost their power, or at least their charm. Every few decades people buried the pillars and put up new stones—a second, smaller ring, inside the first.

he site may have been built, filled in, and built again for centuries.

Bewilderingly, the people at Göbekli Tepe got steadily worse at temple building.

Finally the effort seems to have petered out altogether by 8200 B.C. Göbekli Tepe was all fall and no rise.

Recognize their individuality

The researchers also asked students whether it mattered to them that the instructors knew their names, and more than 85 percent of them said it did

because making good use of the full physical space of a classroom is one of the most straightforward ways to keep both professor and students attentive.

One advantage of the Zoom classes that many of us are teaching right now is that the names are all right there on the screen

Speak to all corners of the room

They bring their unique life stories and experiences, which can help provide new perspectives on familiar questions and challenges.

The obvious solution here is to break that barrier

Use their names regularly.

She encourages children first to recognize and write their own names and then to compare the letters and syllables in their own names with those of the other names on the grid

What is most deserving of our attention in the classroom, of course, are the other human beings in our presence

Google made more than 3,200 changes to its algorithms in 2018, up from more than 2,400 in 2017 and from about 500 in 2010

testing showed wide discrepancies in how Google handled auto-complete queries and some of what Google calls organic search results

Google said 15% of queries today are for words, or combinations of words, that the company has never seen before, putting more demands on engineers to make sure the algorithms deliver useful results.

ALGORITHMS ARE effectively recipes in code form, providing step-by-step instructions for how computers should solve certain problems. They drive not just the internet, but the apps that populate phones and tablets.

Clark started an online fundraiser to pay for bikes. He raised more than $10,000, and neighbors donated dozens of bikes and helmets for the rides.

She couldn’t be sure whether her kids were uninterested or whether they lacked the necessary pens, paper and crayons at home.

He decided he would take his students on socially distanced bike rides across the city. “It was a leap of faith. I got extremely nervous. I was trying to find a way to connect with kids,” Clark said.

her young students are musical detectives, in search of learning. She teaches most grade levels and the school chorus.

t he’s found other ways to keep his students engaged and cycling the city. He invited students to a weekly entrepreneurship class for which they rode their bikes uptown from Dunbar to the gym where Clark works, Sweat DC. The students met with the owner of the gym and the owners of a nearby bar, Hook Hall, and the bagel shop Call Your Mother Deli to learn what it takes to run a business.

She wanted them to create their own composition, their own snowy-day song.

When Clark wanted to teach them about resilience, he took them through the hilly streets of Georgetown.

In lessons for older students, some days there were makeshift drums involved or recorders that students had taken home.

she was able to use the treehouse as a key part of her lessons.

She lugged a bookshelf, desk and heater into the 5-by-7-foot space, and ran an Ethernet cable from the house so she’d have Internet.

before climbing into what passes for her classroom in 2020: her daughters’ decade-old treehouse.

So as one class studied architecture this fall, Daney, 54, encouraged them to walk in their neighborhood to take photos of houses of different styles: ranch, colonial, Victorian.

nd he stuck with his usual method of helping students learn about the design process, asking them to prepare a meal. They started with ideas and research, made a plan, carried it out and evaluated it. The result: soups and pastas and pastries.

Kids need connection, he said. “I think they’re starving for conversation,” including with adults.

In fifth grade, students are expected to learn how to add, subtract, multiply and divide with whole numbers, decimals and fractions. Through a computer application the students have, they can program the robot to move a certain distance, stop, maybe even turn.

With learning all-virtual, he packs a big Ziploc bag — for each student, each quarter — with things like fishing line, foam board, pipecleaners, magnets, Popsicle sticks and rubber bands. Whatever they will need for their projects.

And a lot of the math is a little sneaky. They think they are trying to get the robot to move, when they are actually measuring the angles to get it to move.”  

Others complete their math problems directly on the computer, which can lead to some troubles as they try to show their work.

When Kristin Gavaza interviewed for the music teacher position at Dorothy I. Height Elementary in the summer, she told the principal she had some ideas for how to create a festive concert while students were scattered and learning from home.