"You're saying our lives are like light waves/quanta?" JB asked. "We have fate and free will all at once?" "Exactly!" Jonah said. JB was rubbing his forehead. "I'd have to double-check to see what scientists in this time period think about light, to really know how to answer you without ruining time," JB said. "The problem is, if you don't know if you're riding a wave or a quantum packet of light, how do you make your choices? How do you decide how to live your life? How do you know what's important?" "Well, it seems like things work out best when time travelers try to help people," Jonah said, shrugging. He thought about how long it'd taken him to realize that he should give Mileva the Elucidator. Back in 1611 he'd been slow about figuring out how to help too. And in 1600 he'd been a total idiot about his priorities. "But which people are you supposed to help?" JB asked, sounding as if he really wanted to know. "I'll go back to the Einstein analogy you used before, about the bowling ball on the trampoline, changing the paths of the little marbles around it. Time travelers always thought Einstein was"