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Years ago, while standing among the massive stone pillars at an ancient archaeological site at sunrise, I watched the morning light cut through a narrow stone corridor and strike the center altar with pinpoint precision. It hit me that thousands of years before anyone owned a wristwatch or a smartphone, our ancestors were solving the…

A few decades ago, my grandfather kept a thick paper grid pinned to the kitchen wall with a wooden pencil dangling from a piece of string. Every morning before drinking his tea, he would draw a firm pencil mark across the current day. If someone asked him why he never skipped that morning habit, he…