“Like a sixty-year-old person on actuarial charts, the habitable Earth is three-quarters of the way through its calculated life expectancy. Earth is about 4.57 billion years old, and the laws of stellar physics tell of another billion years before the sun expands to the point that it bakes the possibility for life off the planet. Looking back, life got going quickly after Earth’s formation – within a paltry few hundred million years. Bodies took roughly 2.5 billion years to come about. Then, one after another, heads, hands, and consciousness arose in ever more rapid succession. As in Moore’s law, which famously describes the doubling power of silicon chips every twenty-four months, the biological world has witnessed exponential rates of change: it took most of the expected life span of our planet for the origin of a big-brained species using stone tools; then merely thousands for the origin of the Internet, gene cloning, and schemes of geo-engineering the atmosphere of the planet itself. Planetary and biological change have brought about a transformative moment – one in which ideas and inventions shape our bodies, the planet, and the interactions between them. Before our species hit the scene, trillions of algae took billions of years to transform the planet; now change is driven by single ideas traveling at the speed of light.”
(page 157)
Neil Shubin. The Universe Within: The Deep History of the Human Body. New York: Vintage, 2013. Ebook.
Borrowed in digital format from the Vancouver Public Library.