John Updike
'Cosmos' recap: Deeper and deeper still
'Cosmos' recap: Deeper and deeper still

Things get small — really small — in this week’s episode of "Cosmos," which tackles the unseen universe at the atomic scale, from the teeming ecosystem inside a single dewdrop and the intricate machinery inside a plant’s cells, to the subatomic particles at the heart of a giant exploding star. Carl Sagan famously observed that we are made of star stuff, but that star stuff in turn is made of atoms — the fundamental building blocks of nature — and there are more atoms in the human eye than there are stars in the known universe, according to our host, the Collection of Atoms Known as Neil de Grasse Tyson. (He should come up with own unique sigil,...