Readers weigh in on the Brazil nut effect, clock entropy and more

How ’bout them nuts?

X-ray CT scans reveal that jostling a box of mixed nuts nudges oblong Brazil nuts to point more vertically, allowing the bulky nuts to rest on top as smaller ones sink to the bottom, Maria Temming reported in “How physics helps Brazil nuts come out on top” (SN: 6/5/21, p.