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SENS stands for Strategies for Engineering Negligible Senescence.
SENS is a detailed plan for curing human aging.
It focuses on figuring out how to fix the damage caused by aging processes. Damage seems easier to figure out and reverse than figuring out metabolism or pathalogy.
Like a car. Understanding the chemical processes that cause rust and friction are hard. Understanding cascade failures in an engine can be hard. However, seeing the wear and tear on car components and then replacing them before they fail is less hard.