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Not rocket science
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.
Just follow the instructions on the box, it's not rocket science.

Not touching that with a ten foot barge pole
Not touching that with a ten foot barge pole (or sometimes just a ten foot pole) means refusing to get involved with something because it seems unpleasant, risky, or troublesome.The idiom draws from the long poles used to push barges along canals. A barge pole was long enough to push a boat a fair distance, so the phrase suggests staying as far away from a problem as possible.
After hearing how spicy that chili was, I said I was not touching that with a ten foot barge pole.

Not without a fight
Not without a fight means refusing to give in to something without trying to resist it.The expression comes from the literal idea of fighting to defend something. Over time it became a figurative way to describe standing up for yourself or refusing to give in quietly.
She was not going to give up the project without a fight.
