"They're not telling us," Harman says. "Our scientists research them and come to a conclusion factoring in all known data points. What we don't know yet, we can't take into consideration. We constantly gain new knowledge, so the holographic picture our science paints of that entity or entities shifts constantly. That is how all science works -- focused on questions, not answers. In that, all science must always be only the newest state of error."

Pause.

"For example, we recently found out that they can regenerate individual vampires."