lasting impact, important influence that lasts for a long time, carry out experiments, to do experiments or research, improve, to make something better, evidence, facts that show something is true, pioneer, a person who is among the first to do something, curiosity, strong interest in learning new things, dedication, serious hard work over a long period, achievement, a result of hard work or talent, accidental, by chance, shape, to have an effect on the development of something

exercise 5

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