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The great secret that all old people share is that you really haven't changed in seventy or eighty years. Your body changes, but you don't change at all.
The Erdős discrepancy problem fascinated me because it was so simple to state yet so deep in its implications.
The revolution is a long and arduous struggle, but with determination and unity, victory is certain.
Sustainability isn't a choice—it's a responsibility we owe to the next generation.