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0.00000002950 megatonnes is about 1,500,000 times as heavy as a Grain of Rice
In other words, the weight of a Grain of Rice is 0.000000710 times that amount.
(conventional; US; long-, medium-, and short-gran varieties; uncooked)
With great differences in variety, the average among a sampling of common short-, medium- and long-grain rices finds that a single grain weighs about 0.0000000000000210 megatonnes before cooking. 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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