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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“Beauty satisfies the senses completely and at the same time uplifts the soul. That which gratifies the senses is pleasant, and that which uplifts the soul without being sensual in the least is good, true, right, anything you like, but not beautiful.”
—Franz Grillparzer (1791–1872)