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Oxygen once rusted oceanic iron into seafloor formations that became the major source of iron ore mined today.
On Koshima, Japanese macaques learned from young female Imo to wash sweet potatoes in seawater, making them clean and salty.
Tiktaalik's fin bones match the one-big-bone, two-bones, many-small-bones pattern found in later reptiles, amphibians, birds, and mammals.
Digital information has appeared three times in natural history: DNA, human language, and binary computers.
Mitochondria specialized in energy capture while host cells handled information processing, locking both into mutual dependence and giving cells more usable energy.
Eukaryotes appear abruptly, almost “out of nowhere,” unlike ordinary gradual evolution. The timing of their origin and plastid acquisition remains unknown.
Human societies with language marked a phase transition: information began moving culturally from brain to brain, not only through genes or epigenetic mechanisms.
Humans adapt culturally faster than genes can: Arctic people make clothes instead of evolving thicker fur.
Mitochondria still carry tiny genomes, but most ancestral bacterial genes moved into the cell’s nucleus.
Consciousness plausibly evolved to integrate the vast information arriving through newly evolved sensory systems.
As recurring ice ages erased familiar foods, humans relied on cultural inventions that spread faster than genes and accumulated across generations.
Human bodies remain broadly like those of 30,000 or even 100,000 years ago, while cultures changed beyond recognition.
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