far more influential piece far more influential piece far more influential piece far more influential piece double-helix structure of DNA the double helix "double helix" structure of DNA DNA molecule DNA--The Double Helix far more influential piece DNA molecule far more influential piece far more influential piece the double helix "double helix" structure of DNA double helix structure of DNA far more influential piece DNA molecule far more influential piece far more influential piece DNA molecule Discovery of DNA far more influential piece