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Greg combines time at his desk with time behind the wheel. He's responsible for the development and testing of the automatic transmission systems in cars.  - an automotive engineer, Anna uses her knowledge of the Earth's crust to locate underground deposits of oil. - a geologist , Betty fits contact lenses under the supervision of an optometrist. - an optician , Workers in Charlie's laboratory are developing a new formula for oil-free makeup. - a chemist, Debbie studies the environmental impact of industrial waste disposal. - a biologist , Helen helps developing countries preserve more of their harvested grain against insects and mold. - an agricultural engineer , Ian works on ways of cleaning up our oceans, rivers, and drinking water. - an environmental engineer , Julian works on developing low carbon electricity generation in an effort to combat global warming. - a mechanical engineer , Kate develops radiation treatments that fight cancer. - a biomedical engineer ,

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