Sometimes, we think they are dirty and we don't want to close to them. It's not right. They clean our environment by their hard work.

有的时候，我们会觉得他们很脏，甚至不想靠近他们，这是不对的，他们通过自己的辛勤工作使环境清洁了。

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But Waller said it's the recognition of what the Nobel panel called the "incalculable value" of his agency's work that helps when employees are having a hard time with their sometimes slow, frustrating work.

CNN: Laureates to Nobel winners: Prepare for 'lightning bolt'

People who sometimes have a hard time participating in society do better when they work with living things and know that their work improves our collective society.

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