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Huawei is only one of the local IT heavyweights to set up facilities in Shenzhen, which is in Guangdong province, just north of Hong Kong.
Each year, hundreds of people come from all over China to work in the country's tech manufacturing centre, many of them recruited straight from university. They come despite the air pollution, the high rents and expectations of hard, long work.
"The thing that you find here that you don't find in a lot of places in China is that the people feel like they can become anything they want," Raffensperger said.
Image: Karen Friar