The speed of dark

Funny quote from the Amazon interview with Brian Greene about his new book “Icarus at the Edge of Time”:
I recently told my two and a half year old son a bedtime story that involved space travelers moving near the speed of light. Within days he was telling his own animated stories of dinosaurs and monsters outrunning a new and wonderful concept—“the speed of dark.”
It just goes to show: dark is way more bad-ass than light.