In signal processing, the half time is the time it takes for the amplitude of a pulse to drop from 100% to 50% of its peak value.
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“It would seem that man was born a slave, and that slavery is his natural condition. At the same time nothing on earth can stop man from feeling himself born for liberty. Never, whatever may happen, can he accept servitude; for he is a thinking creature.”
—Simone Weil (1909–1943)