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The phrase it's not rocket science means that something is not very difficult to understand or do. People say this when they think a task or idea should be simple.
This idiom became popular in the 20th century, when rocket science was widely seen as one of the most complex and technical kinds of work. By comparison, ordinary tasks seem easy.
This idiom became popular in the 20th century, when rocket science was widely seen as one of the most complex and technical kinds of work. By comparison, ordinary tasks seem easy.
Just follow the instructions on the box, it's not rocket science.