President LUIZ INACIO LULA DA SILVA (Brazil): (Through translator) My mother, who was poor, would make me and my brother lift up the sofa so she could clean the dirt that no one saw - just like my government - we expose the dirt that had been pushed under the rug and we never stopped an investigation.

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Part of the benefit, everyone agrees, is that there are huge benefits to not being dirt-poor: clean drinking water, good medical care and safe housing, to name a few.

FORBES

More fascinating, less dirty - Dyson now engineers motors in a room so clean no pollutants, pollen or dirt can damage the finely tuned technology being made by the highly calibrated production line.

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Looj uses a high-velocity, four-stage auger to blast away leaves, dirt and clogs while brushing gutters clean.

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And all of them have a very limited dirt-storage capacity, so having very clean floors to start with is a plus.

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The Opificio's restorers plan to clean David by applying compresses of distilled water to the marble surface to draw away dirt.

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Let us not make things worse by sequestering carbon and so sweeping dirt under the carpet and relying on future generations to carry out a meaningful clean-up.

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They built a thin layer, or "nanostructure, " using minute particles of titanium dioxide, a substance that reacts with sunlight to break down dirt and other organic material and can be coated on cotton to keep the fabric clean.

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