How do scientists investigate scientific problems? How can their approach be used in everyday life?
And a brief description is given here.
Why do we follow it? Because it prevents you from thinking things what ain't so. And how can use it in your everyday life? Well, have you ever lost your house-keys or your car-keys? So the scientific problem is defined.....
And of course while no-one can have a perfect memory, each time you ask these questions, and potentially falsify them, i.e. eliminate them as possibilities, you are narrowing down the true location of the keys. Good luck.