Love is physics (metaphor)
To paraphrase the text, "Love is the strongest kind of energy. Katie and Adam loved each other. They could not love each other in his world and they could not love each other in her world. However, all that love, all that energy, it had to go somewhere. It went into that baby." Even if they could not have each other, they would have both had their baby. However, Katie and Adam lost that energy that could unite them into a separate space. They lost their son, who could unite Katie and Adam into a family.
Another world (simile)
The Amish live in a settlement that is far away from the modern world. Their community exists unobtrusively within the regular world, “like a small air bubble impervious to the fluid around it”. They have their own world with their rules and preferences and do not want to communicate with other people.
Aliens’ speech (simile)
When a judge tells Katie why she is a suspect, a girl cannot understand the judge’s speech, because she does not know legal terms well. Moreover, “the words run over her like a rain shower, too much English at once, all the syllables blending”. The judge speaks so quickly that Katie closes her eyes and sways slightly.
