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A seed is a fully formed embryo that can stay dormant for years, even centuries, until the right mix of temperature, water and light signals that growing is worth the risk. Once it germinates it cannot go back, and its first root is a one-time gamble on that exact spot. Survival depends less on vigor than on timing the single irreversible commitment correctly.
Before winter, trees drop their leaves and move water out of their cells, packing the remaining fluid with sugars. The cell contents then set into a glass-like solid instead of forming ice crystals that would tear the cell walls. Surviving extreme cold is therefore a months-long preparation triggered by shortening days, not a response to the first frost.
Jahren was analyzing the hard pits of hackberry seeds, expecting them to be carbonate, when her lab data showed they were largely made of opal, a form of silica. She describes realizing she was, for a moment, the only person in the world who knew this small true fact. For her, that private moment of discovery is the core reward of science and repays years of unpaid and invisible work.
American research labs run on small grants of roughly three years, so a principal investigator spends much of their time writing proposals and scrambling to make payroll instead of doing research. Jahren and her longtime lab partner Bill kept their labs going by scavenging equipment, living on almost nothing, and moving institutions. The funding structure rewards short, safe projects and makes studying slow processes like tree growth, which play out over decades, especially hard.