The most expensive item ever built is the International Space Station, costing over $150 billion.
Fact #11408
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The Gulf of Tonkin incident was later shown to involve disputed reports of attacks.
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X-rays were discovered in 1895 and transformed medical imaging.
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Nothing can travel faster than light in a vacuum.
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The cotton gin increased cotton processing efficiency.
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The mechanical clock improved timekeeping accuracy.
Fact #1565 · General
The 26th Amendment lowered the voting age to 18.
Fact #1114 · General
The Inca built extensive road systems across the Andes.
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Nothing can travel faster than light in a vacuum.
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