Power, Sex, Suicide

Nick Lane argues that the acquisition of mitochondria by an ancient single-celled organism was the pivotal, likely one-off event in the history of life on Earth, the moment that made it possible for cells to become large, complex, and energetically capable of building everything from mushrooms to whales. Before this merger between two simple microbes, life had spent billions of years stuck at the bacterial level of complexity; afterward, an explosion of biological possibility followed, because the new arrangement supplied enough usable energy per gene to support much bigger genomes and much more elaborate cellular machinery.

The argument matters because it recasts mitochondria as an active force shaping the biggest features of complex life, not a passive power plant we can ignore once we've learned the metabolic chemistry. Lane connects mitochondrial function to why sexes exist, why cells are built to self-destruct on command, and why bodies age and eventually fail, suggesting a unifying energetic logic beneath phenomena that biology usually treats as separate topics. It also implies, more speculatively, that complex life may be a rare cosmic accident rather than an inevitable outcome of evolution.

Who should read it

Readers with a taste for ambitious, mechanism-driven science writing, and anyone curious why bodies age or why sex evolved at all, will find this rewarding, though some chapters assume comfort with biochemical detail. It's best suited to readers willing to follow a sustained, technical argument rather than looking for light, anecdotal science writing.

About the author

Nick Lane is a British biochemist and professor at University College London who researches the evolutionary origins of life and cellular energy, and has written several acclaimed books on the biochemistry of evolution.