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521 kilograms is about 20,000,000 times as heavy as a Grain of Rice.
In other words, it's 18,000,000 times the weight of a Grain of Rice, and the weight of a Grain of Rice is 0.0000000560 times that amount.
(long grain; 14% moisture content)
A single long grain of rice weighs an average of 0.0000290 kilograms. A staple through most of human history, archaeological evidence indicates that the earliest rice cultivation was about 11,500 years ago.
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