http://www.businessinsider.com/why-potato-chip-bags-empty-top-half-full-2017-8
origin - http://www.pipiscrew.com/?p=9728 why-potato-chip-bags-are-always-empty-at-the-top
http://www.businessinsider.com/why-potato-chip-bags-empty-top-half-full-2017-8
origin - http://www.pipiscrew.com/?p=9728 why-potato-chip-bags-are-always-empty-at-the-top