چندتا هسته‌ی ماشین را باید در جعبه بگذاریم تا چگالی جعبه‌ی یک‌فوتی شما به اندازه‌ی هسته بشه؟ 
How many cars' nuclei would you have to put into the box to have your one-foot-box have the same density of the nucleus? 