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Process of Science: Given that Einstein's equations naturally showed the possibility of an accelerating Universe,why have astronomers only recently found strong evidence for dark energy?
Overtime
Working time that extends beyond the normal or scheduled working hours, often compensated at a higher pay rate.
Melatonin
A hormone produced by the pineal gland that regulates sleep and wakefulness.
Pineal Gland
A small endocrine gland in the brain that produces melatonin, a hormone that modulates sleep patterns.
Sleep Cycle
The progression through various stages of sleep, including REM (rapid eye movement) and non-REM stages, typically recurring several times throughout a typical sleep period.
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