The WSJ is reporting.
16.8 millimeters.
Between 2005 and 2011.
Six years.
16.8 mm/6 years = 2.8 mm/year.
OMG.
The popsicle post is here.
The thickness of an average human fingernail is about 0.3 to 0.5 mm thick. According to wiki, human nails grow at an average rate of 3 mm (0.12 inch) per month.
The thickness of pencil lead varies, but is commonly 0.7 mm.
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