Domestic gas boilers generally adapt over 90 per cent of their fuel's energy into valuable, useable heat.

You might find your inability to puzzle-out the value that you experienced highly disconcerting, specifically if you view this seeming not enough insight as an indication that you're 'stuck' or have stopped growing as a spiritual being. You see, scrapbooks trigger memories not for the purpose of giving your head a workout, but to enrich your soul.