Scientists and engineers have invented filters and other met

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  I used to meet him occasionally onFifth Avenue.

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  Biogas can be utilized for electricity production, cooking, space heating, water heating and process heating.

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  During the five-decade history the Asian Games have been advancing in all aspects.

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  Around 150 B.C. the Greek astronomer Hipparchus developed a system to classify stars according to brightness.

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  Population growth rates vary among regions and even among countries within the same region.

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  As children we were very close, but as we grew up we just drifted apart.

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  She decided to remain celibate and devote her life to helping the homeless and orphans.

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  Many scientists agree that global warming poses great threats to all species on Earth.

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  I prefer to talk to people face to face rather than to talk on the phone.

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  The workforce is generally accepted to have the best conditions in Europe.

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