Correction for the weight of a Human Heart
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How heavy is 3 grains?
It's about one-one-thousand-five-hundredth as heavy as a Human Heart
The weight of a Human Heart is about 4,800 grains.
(human; adult)
The average human heart weighs about 4,800 grains. Each minute, the heart pumps between 10 and 20 liters (3 to 5 gallons) of blood through its chambers.