The origin of the practice is unclear - padlocks have appeared in China for years at sacred sites, and there was a flurry of padlocking in the Hungarian town of Pecs in the 1980s, when university students locked them on a bridge next to the university either as a symbol of undying love or their determination to finish their courses.

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On September 22, 2010 Tyler Clementi, a Rutgers University student, jumped to his death from a bridge after his roommate, Dharun Ravi, taped and then streamed online Clementi kissing another man.

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Professor LESLIE ZEBROWITZ (Brandeis University): It's a rounder face, bigger eyes, a smaller nose bridge, a shorter chin.

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Professor Roger Falconer, a water management specialist at Cardiff University, said the force of the water swirling around the bridge's pillars was undermining the foundations.

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The CCTV images showed the car in Bridge of Allan then returning through the town a few minutes later travelling towards the university.

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The student, Mr. Li, said he and the other students were initially trapped in the mountains after the quake caused a bridge to collapse, but they were on their way back to Chengdu after their university sent shuttles to pick them up.

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Start at the Anderson Memorial Bridge near Harvard Square and pedal east along Memorial Drive to get a glimpse inside the gates of Harvard University and the Massachusetts Institute of Technology.

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