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39 grains is about 0.0000004 times as heavy as a Tyrannosaurus rex.
In other words, it's 0.000000390 times the weight of a Tyrannosaurus rex, and the weight of a Tyrannosaurus rex is 2,600,000 times that amount.
(for FMNH PR2081, a.k.a. "Sue") (a.k.a. Tyrannosaurus, a.k.a. T-Rex) (estimated live weight)
The notable Tyrannosaurus specimen housed at the Field Museum of Natural History in Chicago, Illinois, "Sue," is estimated to have weighed about 99,000,000 grains while alive. A renowned predator in popular culture, the teeth of tyrannosaurus rex were up to 33.02 cm (13 in) long.
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