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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.

Students submit their annotations via their smart phones or other digital devices, and then analyze each other’s notations collectively.  They could be looking for main ideas, thematic and literary elements, or big ideas from the work.   They could be looking for evidence of connections to other texts, their own experiences, or world issues. They could simply be searching for meaning to support them when reading complex texts.

annotexting will allow students to engage with other audiences in tasks with an expanded purpose

In order to get students to own this process, we have to relinquish some control. Let them think, let them make mistakes and respond. Let them draw conclusions even they are not the conclusions we would have drawn. We can be there to coach them through misconceptions.

there is no such thing as a dumb question, because as cognitive scientist Daniel Willingham notes in his book Why Don't Students Like School?, it's the question that stimulates curiosity -- being told the answer quells curiosity before it can even get going.

Student-centered classrooms are the goal of my teacher-designed blended learning model. Giving students control over the learning process requires that they know how to communicate, collaborate, and solve problems in groups, pairs, and individually. This work can be messy, loud, and disorganized, but in the end, the learning is much more meaningful.

Then I found Collaborize Classroom, a free, dynamic discussion platform. I used it to replace many of my pen-and-paper homework assignments with vibrant online debates, discussions, writing assignments, and collaborative group work.

Remember that mistakes lead to learning. The best resources I've designed and the most effective strategies I've developed were all born from and refined through mistakes.

I anticipated that students might hit some bumps as they navigated their first TED-Ed lesson, so I set up a TodaysMeet back channel so students could ask questions, make comments, and access a support network while going through the online lesson. A back-channel tool makes it possible for people to have a real-time conversation online while a live presentation or real-time discussion is taking place.

I asked students to reference specific details to support their assertions, as did one student who commented on the town's poverty by noting that the local doctor often took potatoes as payment for his work. She also showed how the characters nevertheless reflected the country's "cautious optimism" about its future: That same doctor was still able to support himself, she pointed out, and he enjoyed his work. Students posted their responses, complimenting strong points made, asking questions, and offering alternative perspectives.

I asked students to analyze examples of strong discussion posts and revise weaker posts. I also realized that I needed to embed directions into our discussion topics to remind students to respond to the questions and engage with their peers. I started requiring them to thoughtfully reply to at least two classmates' posts, in addition to posting their own response to the topic.

It's crucial for students to see that the work they do in the online space drives the work they do in the classroom so they recognize the value of the online conversations.

For example, during the To Kill a Mockingbird unit, we researched and discussed the death penalty in preparation for writing an argument essay. The students debated online such issues as cost, morality, and racial inequality and then delved into these topics more deeply face-to-face in class.

In the classroom, the teacher might give small groups various topics to research. Then he or she could ask students to go online to research and discuss their topic on a shared Google Doc and create a presentation using Glogster, Prezi, or Google Presentation Maker.

Some teachers think that incorporating online work means they have to be available 24 hours a day. This is not the case. When students are connected online, they have a network of peers they can reach out to for support, and they begin to see one another as valuable resources in their class community.

I've embedded a Google map in my website that has pins dropped in all the locations on our campus and in our community where there are computers with public access to the Internet.

I even wrote the local computer recycling center to request a computer for my class.

That is their reality; it wasn't ours. The NCTE knows it.