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0.00000000000000005850 megatonnes is about one-five-hundredth as heavy as a Grain of Rice
In other words, the weight of a Grain of Rice is 500 times that amount.
(long grain; 14% moisture content)
A single long grain of rice weighs an average of 0.0000000000000290 megatonnes. 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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