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He noted that similar studies in the U.S. have found that college students perform better after reading positive messages, and that he replicated the experiment by having older students tell younger students that they should "expect middle school to be difficult but doable" -- and found that state test scores increased dramatically.

The researchers also found that test relaxation techniques that seem obvious to most teachers, such as telling students that they can perform well, can actually make kids more anxious -- and thus perform at lower levels. "It makes sense to me," Alcala, the Berkeley teacher, said of the study. "I've been doing it [my favorite no] for four years now, and my kids' understanding is significantly better than before, as measured by test scores."

Estimates by officials and human rights groups of the number of dead have ranged from 300 to more than 500 in the attack here and in two nearby villages, Zot and Ratsat.

The people here spoke of a well-organized gang of dozens who stealthily surrounded the village before dawn. They had come on foot from the low hills surrounding this rocky plateau, Muslim herdsmen apparently bent on revenge for similar killings in January and angry over what one rights group said were cases of cattle rustling.

A separate corps — men with machetes, or “cutlasses” as some villagers described them — began their work. “I saw them with very long, white swords,” Mr. Pam said. “Some were dressed in black, and some in camouflage.” The men were ruthlessly efficient, and in halting sentences the villagers described the carnage that followed. “They killed my daughter and my son,” Ezekiel Chwang said. “It was Sunday night. They surrounded our house. They were shouting.” He climbed into a tree to escape the marauders, and dropped back down after they had left, to find a horrific scene in his home. The men, he said, had discovered his 6-year-old daughter and 4-year-old son sleeping in the bedroom. They slit their necks with a machete, then set them on fire.

human rights experts on this region said it was all too reminiscent of previous episodes, including the killing of Muslims by Christians in January. “There many similarities as far as the targeting of unarmed residents, including women and children,” said Eric Guttschuss of Human Rights Watch.

Perhaps 3,000 have died in these ethnic-religious conflicts in the region surrounding this village since 2001, in the estimates of rights groups. There have been investigations and commissions of inquiry, but little retribution. The police here, known for their summary methods, say they have already arrested around 100 people in connection with Sunday’s killings.