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Catalytic converter

An integral part of vehicle emission control systems since 1975. oxidising converters remove hydrocarbons and carbon monoxide (CO) from exhaust gases, while reducing converters control nitrogen oxide (NOx) emissions. Both use noble metal (platinum, palladium or rhodium) catalysts that can be "poisoned" by lead compounds in the fuel or lubricant.

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Industry/Domain: Archaeology Category: Evolution

Genetic drift

Changes in the frequencies of alleles in a population that occur by chance, rather than because of natural selection.