Word: darkeness
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...learns to make sense of the external world. Interfere with that process, and you can cause permanent, irrevocable damage. If a child is born blind, for example, it's pretty much over by age 6. You can fix the eyes, and they might be able to perceive light and dark. Without the right visual circuitry in place, though, there's no way to form images--the essence of true sight...
...little hope, though, of restoring vision to children who were past the critical development period. While research with humans has been very limited, experiments with animals have shown that if you place a normal kitten, for example, in a completely dark chamber immediately after birth, the kitten will become irrevocably blind. As a result, doctors in developing nations are often reluctant to perform surgeries like cataract removals on children. The risks--infection, mostly--outweigh the meager rewards...
Charbonneau said there could still be water on HD 189733b, but that dark clouds made of silicates in the planet’s atmosphere might make it impossible to see through...
Students’ daily schedules do not often conform to their biological clocks’ pleas for them to sleep when it begins to grow dark outside...
...downtown. When my son's friend fell off the monkey-bars at his downtown school playground, a Secret Service agent came to the rescue. The candidates aren't just downtown, they're in our neighborhoods, eating at our local diner, knocking on our doors, driving by in motorcades of dark-tinted jeeps. "Any calls?" my husband asked me one fairly typical day before the caucuses in 2004. "Yup," I replied. "The Little League coach and John Kerry inviting you to a 'little barbeque...