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lee-kong-chian-natural-history-21.jpg lee-kong-chian-natural-history-11ThumbnailsA pendulum clock telling the time from simple oscillations...lee-kong-chian-natural-history-11ThumbnailsA pendulum clock telling the time from simple oscillations...lee-kong-chian-natural-history-11ThumbnailsA pendulum clock telling the time from simple oscillations...