How many cells do you have?
The average eukaryotic cell is about 100 μm (100 x 10-6 m. = 10-4 m.) long.
Your body has 100 trillion (1014) cells (p. 15).
Total length of your cells lined up end-to-end: (1014) x (10-4 m.) = 1010 m. = 107 km.
The earth's circumference is 40 million m. (40 x 106 m. = 4 x 107 m. = 4 x 104 km.
107 km. / 4 x 104 km. = 250: your cells can wrap around the earth 250 times.
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Copyleft Peter Chen