A male Solenosteira macrospira, left, carries snail eggs on its shell. But not all of the eggs were fertilized by him. Females, like the one on the right, deposit the eggs into papery capsules and attach them to the males' shells.
P.B. Marko/Ecology Letters
British novelist Zadie Smith is also the author of White Teeth, The Autograph Man and On Beauty. In her latest book, NW, she lays out a problem for readers: Do people get what they deserve?
Tiziana Fabi/AFP/Getty Images