# Over a time span of 300 million years we are all amphibians by Freeman Dyson > "Over a time span of 300 million years we are all amphibians." > **— Freeman Dyson**, *Disturbing the Universe / later essay, attribution clue* Verification Status: Unverified — exact wording/source has not yet been independently confirmed against a primary source; source clue: Disturbing the Universe / later essay, attribution clue.