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He says that Beatrice should not consider her poison misery because she is the most powerful creature on earth.

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He was studying his daughter and Giovanni without them knowing(not completely Giovanni but he didn't think he was at first)
Also, at the end of scene five, it says that Rappaccini has been watching Beatrice and Giovanni without them knowing he was there.

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He wants to learn everything about science.

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He want to learn more things

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He prioritize science over human life and made a flower that make people poisonous.

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He does not touch or smell any of the plants to be careful

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He keeps studying plants and science without stopping

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He is a doctor and he does a lot of experiments