Word: sunlights
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...edges of the frame. Serendipitous little details, like the windblown edge of a scarf, take on large but ambiguous meaning. But because DeCarava is black, or because his subjects are, those same details can take on additional layers of ambiguity. Look at the wedge of sunlight that hems in the girl in his 1949 picture Graduation. Because of the way it seems to guide her into a more confined future, the light feels ominous. Because the girl is black, the hint of dwindling expectations has an additional gravity for her situation and for DeCarava's account...
...streetscapes are warmer than comparable pictures by other great names in the same tradition. For the most part DeCarava is less gloomy than Robert Frank, less chilly than Garry Winogrand. What he likes is the way the flouncing liner of a woman's overcoat rhymes with a slice of sunlight as she steps down a stairway. Even though the top of the frame cuts off the upper half of her body, she's not altogether anonymous. He still lets us sense her aplomb...
...hour later and he might not have noticed the rock, much less stooped to pick it up. But the early morning sunlight slanting across the Namibian desert in southwestern Africa happened to illuminate momentarily some strange squiggles on a chunk of sandstone. At first Douglas Erwin, a paleobiologist at the Smithsonian Institution in Washington, wondered if the meandering markings might be dried-up curls of prehistoric sea mud. But no, he decided after studying the patterns for a while, these were burrows carved by a small, wormlike creature that arose in long-vanished subtropical seas - an archaic organism that...
Without oxygen to aerate tissues and make vital structural components like collagen, notes Knoll, animals simply cannot grow large. But for most of earth's history, the production of oxygen through photosynthesis - the metabolic alchemy that allowed primordial algae to turn carbon dioxide, water and sunlight into energy - was almost perfectly balanced by oxygen-depleting processes, especially organic decay. Indeed, the vast populations of algae that smothered the Precambrian oceans generated tons of vegetative debris, and as bacteria decomposed this slimy detritus, they performed photosynthesis in reverse, consuming oxygen and releasing carbon dioxide, the greenhouse gas that traps heat...
...reset a subject's biological clock according to light exposure, in a process called "entrainment," the lights in the suite can be raised to an intensity of 10,000 lux, which is about the intensity of sunlight at dawn or dusk...