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Ancient Ethiopian traders and mathematicians used a doubling-and-halving method of multiplication that effectively decomposed numbers into powers of two—an approach mathematically equivalent to the binary logic that underpins modern day computer processors.

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Divide the lintel circle at Stonehenge into 30 parts and each spans 10.56 feet. Halve that and a unit emerges: 5.28 feet — the human pace. Count 1,000 of those paces and the result is a mile. This suggests the mile may not be a modern invention at all, but a legacy of an ancient system of measurement encoded in megalithic design.

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