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39 grains is about one-two-hundred-thousandth as heavy as a Polar Bear.
In other words, it's 0.00000490 times the weight of a Polar Bear, and the weight of a Polar Bear is 204,000 times that amount.
(Ursus maritimus) (adult, male)
An adult, male polar bear weighs between 7,960,000 grains. Polar bears are so heavily insulated by their 9.9 cm (3.9 in) layer of blubber that they are often difficult to detect using infrared photography sensors.
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