Lab Girl

by Hope Jahren

There is six hundred times more life on land than there is in the ocean, and this fact mostly comes down to plants. The average ocean plant is one cell that lives for about twenty days. The average land plant is a two-ton tree that lives for more than one hundred years. The mass ratio of plants to animals in the ocean is close to four, while the ratio on land is closer to a thousand. Plant numbers are staggering: there are eighty billion trees just within the protected forests of the western United States. The ratio of trees to people in America is well over two hundred.

Leaves make sugar. Plants are the only things in the universe that can make sugar out of nonliving inorganic matter. All the sugar that you have ever eaten was first made within a leaf. Without a constant supply of glucose to your brain, you will die. Period. Under duress, your liver can make glucose out of protein or fat—but that protein or fat was originally constructed from a plant sugar within some other animal.

Underneath every mushroom is a web of stringy hyphae that may extend for kilometers, wrapping around countless clumps of soil and holding the landscape together. The ephemeral mushroom appears briefly above the surface while the webbing that anchors it lives for years within a darker and richer world.

The NSF is a U.S. government agency, and the money that it provides for scientific research comes from tax dollars. In 2013, the budget of the NSF was $7.3 billion. For comparison, the federal budget allocation for the Department of Agriculture—the people responsible for supervising food imports and exports—was about three times that amount. Each year, the U.S. government spends twice as much on its space program as it does on all of its other scientists put together: NASA’s 2013 budget was more than $17 billion. And these discrepancies are nothing compared with the disparity between research and military spending. The Department of Homeland Security, created in response to the events of September 11, 2001, commands an annual budget that is fully five times larger than that of the entire NSF, while the Department of Defense’s mere “discretionary” budget comes to more than sixty times that sum.

In order to prepare for their long winter journey, trees undergo a process known as “hardening.” First the permeability of the cell walls increases drastically, allowing pure water to flow out while concentrating the sugars, proteins, and acids left behind. These chemicals act as a potent antifreeze, such that the cell can now dip well below freezing and the fluid inside of it will still persist in a syrupy liquid form. The spaces between the cells are now filled with an ultra-pure distillate of cell water, so pure that there are no stray atoms upon which an ice crystal could nucleate and grow. Ice is a three-dimensional crystal of molecules, and freezing requires a nucleation spot—some chemical aberration upon which the pattern may start to build. Pure water devoid of any such site may be “super-cooled” to forty degrees below zero and still remain an ice-free liquid. It is in this “hardened” state, with some cells packed full of chemicals and others sectioned off for purity, that a tree embarks on its winter journey, standing unmoved through the frost, sleet, and blizzards of the season.

Every spruce does the same thing each autumn: they perform a “bud set,” where they stop growing in anticipation of the first frost. The Norwegian scientists have observed that among hundreds of genetically identical trees, grown from seedling to adult side by side in the forest, the trees that had been embryos under a cold climate invariably set their buds two to three weeks earlier than do their counterparts, anticipating a longer, colder winter.