Achha, photo finish uses a high-speed digital camera with a vertical slit to capture each runner's torso crossing the line, giving an electronic time to the thousandth of a second. Hand times are rounded up to the next tenth because the human reaction to start and stop the watch always causes a delay. In my university lab, we built a basic timing gate with a laser and photodiode, and I saw how even our cheap circuit was faster than any hand. So, for my father's tailoring, the modern mall's computerised bill is like that photo finish—it feels cold, but my old measuring tape and mental maths, like a hand time, are slower, yet carry the warmth of a personal touch.
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