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1. How would scientist choose "7" number?

2. How would you evaluate one of the most famous scientists' discovery?

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1. What is the reason that colors of rainbow disappear?

2. How many basic colors are there considered to be now?

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1. What are the answers about 7 colors?

2. What people apply for colors?

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1. How many of you understand time made as a dye?

2. Why green, blue, red colors appeared after the rain?

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1. What is the remarkable decision to hold up a second prism rainbow?

2. Why did Newton remember seven colors and rainbow?