The explosion of weak ties could have profound consequences for our social structures too, according to Judith Donath of the Berkman Center for Internet and Society at Harvard University.

哈佛大学伯克曼互联网与社会中心的 Judith Donath 认为，弱联系的激增也会对我们的社会结构产生深远的影响。

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The white source near the center of the image is a dense, rapidly rotating neutron star, or pulsar, all that remains of a core-collapse supernova explosion.

图片靠近中心部分的白色光源为一种密度大，急速旋转的中子星，或是脉冲星--都是核心坍缩的超新星爆炸的残留物。

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The images show that the explosion took place 3.8 billion light-years from Earth, at the center of a galaxy where a supermassive black hole would lie.

图像显示该爆炸地点距离地球38亿光年，位于一个星系的中心，那里可能存在一个特大黑洞。

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It is the creative center of the secret Manhattan Project, which made the explosion possible.

VOA: special.2009.06.14

The initial report to police that day called it an apparent transformer explosion at the trade center.

WSJ: NY marks 20th anniversary of World Trade bombing

PRAGUE A powerful explosion in the historic center of the Czech capital city was the result of a leaky gas pipe, not a terrorist attack, and there were no deaths from the accident, the city's mayor said Monday.

WSJ: About 35 Hurt in Prague Gas Blast

Earlier this year, a militant Ahwazi group claimed to have assassinated a Revolutionary Guard colonel, and the Iranian government acknowledged that an explosion in a cultural center in Shiraz, in the southern part of the country, which killed at least twelve people and injured more than two hundred, had been a terrorist act and not, as it earlier insisted, an accident.

NEWYORKER: Preparing the Battlefield