And so an application of the scientific method. Have you ever lost your house keys or your car-keys (of course you have!). And so the scientific problem is defined....#"where are my £?""!&@ keys?"#
And so we ask the questions...
#"When did I last use them?"#
#"To where did I go after that?"#
#"Does the wife have them?"#
#"Are they in my coat?"#
...and of course other questions are appropriate to ask given your personal circumstances. And while no-one can have a perfect memory, each time you ask a question, and potentially falsify it, you narrow down the true location of the keys....