" We go to three parks. We walk nonstop or else she cries. The baby likes moving, especially moving at high speeds, so we go on swings. She opens one eye and looks at me with profound suspicion. What is this contraption? she asks silently, a tiny cyclops in my hands.

This is a simple harmonic oscillator, I say, a pendulum; this is periodic motion.

Wheeeee is the sound I think her temporal lobe wants to make" (p125) "

― Weike Wang , Chemistry