What is meant by the general expression 'Turbines have a memory'?

What is meant by the general expression ‘Turbines have a memory’? Also, describe ‘feathering’ when talking props.
Explain why a modern turbine engine is easier to analyze (from an accident investigation
perspective) than a reciprocating engine.
What is meant by ‘critical flows’ needed by a turbine aircraft?
How do these questions and your answers relate to an investigation?