Soul Searching

By JOHN NOBLE WILFORD
After a closer examination of the Antikythera Mechanism, a surviving marvel of ancient Greek technology, scientists have found that the device not only predicted solar eclipses but also organized the calendar in the four-year cycles of the Olympiad, forerunner of the modern Olympic Games.

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Scientists may have uncovered why some people naturally lose their ability to make new memories as they get older.
Using brain scans, University of Arizona scientists found differences in how older rats “replayed” their actions in the brain during sleep.

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