“How do you know there’s anything important about his work if you don’t know what he was working on?”
Sandra nodded. “We don’t know the details, but we do know that his work had something to do with your mother’s work. We can only guess at the how of it.” She drew in a deep breath and looked distinctly uncomfortable. “How many times have you been through the transfer, Charlie?”
He noticed the switch from his skimmer name to his real one. “Half a dozen times, maybe? Why?”
Her eyes widened a little and she frowned, but nodded. “That many. That’s more than I expected, but there’s nothing we can do about it now. It should be fine. Charlie, time travel is … damaging. We don’t know the specifics, but we know that repeated time travel causes damage to the cells of the body, and we believe your father was working on methods of genetic protection against the effects.”