| 21. | A nano is one-billionth of a unit.
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| 22. | In November 2008, Logitech built their billionth mouse.
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| 23. | It carried its 1.5 billionth passenger on January 24, 2007.
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| 24. | The technique provided a photographic exposure equivalent to 20 billionths of a second.
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| 25. | On 29 December 1997, the one-billionth vehicle passed the bridge.
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| 26. | That distance corresponds to 60-billionths of a second of light travel time.
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| 27. | A nanogram is one billionth of a gram.
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| 28. | And in theory, one will be the planet's 6 billionth person.
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| 29. | The first girl delivered after noon Thursday will be designated the one billionth baby.
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| 30. | The billionth birth was hardly cause for celebration.
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