The crystals of silicon have to be perfect, because even small defects in the material can hurt its efficiency. (sciencenews.org)
But these gadgets are prone to failure, often caused by small defects in their complex electronics, which can result from regular use. (sciencedaily.com)
If you are a trained bus driver in a driving school you will be taught never to drive if you find failures in the system no matter how small the defect you have noticed. (wannadrive.com)