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maybe he is atomically denser but composed primarily of undiscovered elements? or; as he already emits anti-gravitons perhaps they are somehow lattice bound into his atomic structure? or to go realllllyyyy meta perhaps kryptonians employ some unknown quantum principle involving gluons and photons somehow being transformed automatically into gravitons by kryptonian cells and their brain chemistry simply allows them to control the extent to which this takes place, enabling flight (this would make them much more atomically dense without being to much heavier than an average human as their cells may be able to independently regulate their own mass given a specific gravitational field) although this would give rise to many more problems for the cloning storylines... no evidence to support this just one more theory to add to this list...

maybe he is atomically denser but composed primarily of undiscovered elements? or; as he already emits anti-gravitons perhaps they are somehow lattice bound into his atomic structure? or to go realllllyyyy meta perhaps kryptonians employ some unknown quantum principle involving gluons and photons somehow being transformed automatically into gravitons by kryptonian cells and their brain chemistry simply allows them to control the extent to which this takes place, enabling flight (this would make them much more atomically dense without being to much heavier than an average human as their cells may be able to independently regulate their own mass given a specific gravitational field) although this would give rise to many more problems for the cloning storylines...

maybe he is atomically denser but composed primarily of undiscovered elements? or; as he already emits anti-gravitons perhaps they are somehow lattice bound into his atomic structure? or to go realllllyyyy meta perhaps kryptonians employ some unknown quantum principle involving gluons and photons somehow being transformed automatically into gravitons by kryptonian cells and their brain chemistry simply allows them to control the extent to which this takes place, enabling flight (this would make them much more atomically dense without being to much heavier than an average human as their cells may be able to independently regulate their own mass given a specific gravitational field) although this would give rise to many more problems for the cloning storylines... no evidence to support this just one more theory to add to this list...

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maybe he is atomically denser but composed primarily of undiscovered elements? or; as he already emits anti-gravitons perhaps they are somehow lattice bound into his atomic structure? or to go realllllyyyy meta perhaps kryptonians employ some unknown quantum principle involving gluons and photons somehow being transformed automatically into gravitons by kryptonian cells and their brain chemistry simply allows them to control the extent to which this takes place, enabling flight (this would make them much more atomically dense without being to much heavier than an average human as their cells may be able to independently regulate their own mass given a specific gravitational field) although this would give rise to many more problems for the cloning storylines...