The length of diameter of calcium nucleus is ...

2 times smaller than diameter of uranium nucleus (1.95 to be exact).
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830 times smaller than shortest X-ray wavelength .
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8,920 times smaller than diameter of helium atom .
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65,009 times smaller than each side of the unit cell of diamond .
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449,530 times smaller than distance between HDD disk and head .
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5,325,598 times smaller than diameter of bacterial flagella .
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21,301,405 times smaller than diameter SARS virus .
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410,311,812 times smaller than diameter of the largest virus .
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8,835,711,985 times smaller than sperm .
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53,846,979,209 times smaller than each side of the pixel of the LCD monitor .
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250,141,325,615 times smaller than length of lice .
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