The mourning for the victims of Monday's attack reached northeastern China, home of the third person killed in the blasts, Lu Lingzi.

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This gesture represented an early ripple before a wave of modernity was allowed to sweep through his secretive mountain kingdom, a world all of its own between China and the northeastern tip of India.

BBC: Bhutan, the kingdom of the clouds

Fossil discoveries of feathered dinosaurs in northeastern China over the past two decades have challenged Archaeopteryx's place in bird evolution.

NPR: New Study Restores Famed Fossil To "Bird" Branch

She lies in bed in the bare room she shares with her mother in the city of Tonghua, in northeastern China.

NPR: Many Chinese Athletes Find No Glory In Retirement

In short, daily life in a hardscrabble farming village in Szechuan province is a world away from the Shanghai Nanjing Road ritzy shopping street or even an old, walled neighborhood in Harbin, a crossroad of many cultures in northeastern China.

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"When she left hospital, I asked the army if I could take her home to convalesce because her diabetes was so serious, but they said she had to go for winter training with the army team in northeastern China, " says Sun of her daughter.

NPR: Many Chinese Athletes Find No Glory In Retirement

If you want to see how South Korean investment is helping to transform China, visit the northeastern corner of the country where the Chinese, Russian and North Korean borders come together.

CNN: 'The South's Guangdong'

The U.S. track team will train in China ahead of the games, in the northeastern city of Dalian, where the air is cleaner.

NPR: Beijing Races to Clear Its Skies Before the Olympics