From my molecular biology textbook...

[jezredfern]

"But very early in the history of life, a much more efficient method for generating energy and synthesizing ATP appeared. This process is based on the transport of electrons along membranes. Billions of years later, it is so central to the survival of life on Earth that we devote this entire chapter to it."

That struck me as funny, y'all ;)

In case you care: pg. 453, Essential Cell Biology, 2nd Ed., Alberts, et al.