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    Anonymous visitor standing on spiral stairway of concrete Tower building in Oscar Niemeyer International Cultural Centre in Spain — Stock Photo
    Anonymous visitor standing on spiral stairway of concrete Tower building in Oscar Niemeyer International Cultural Centre in Spain
    Looking down spiral staircase — Stock Photo
    Looking down spiral staircase
    Baby and DNA strand, digital conceptual illustration. — Stock Photo
    Baby and DNA strand, digital conceptual illustration.
    Top view of lighthouse with brick walls and small rectangular windows illuminated part of spiral staircase with metal handrail on sunny day — Stock Photo
    Top view of lighthouse with brick walls and small rectangular windows illuminated part of spiral staircase with metal handrail on sunny day
    Colored DNA double helix molecule, digital illustration. — Stock Photo
    Colored DNA double helix molecule, digital illustration.
    Pupils gathered around a molecular model — Stock Photo
    Pupils gathered around a molecular model
    Colored DNA double helix molecule on white background, digital illustration. — Stock Photo
    Colored DNA double helix molecule on white background, digital illustration.
    Illustration of damaged DNA strand on gray background. — Stock Photo
    Illustration of damaged DNA strand on gray background.
    Molecular models of DNA — Stock Photo
    Molecular models of DNA
    An extinct marine invertebrate Morocco. Existed during the Cretaceous period. During fossilization the shell was replaced by an iron compound. — Stock Photo
    An extinct marine invertebrate Morocco. Existed during the Cretaceous period. During fossilization the shell was replaced by an iron compound.
    From above of modern spiral stairway with white railings and light walls and stairs in contemporary building — Stock Photo
    From above of modern spiral stairway with white railings and light walls and stairs in contemporary building
    DNA molecule, abstract scientific illustration. — Stock Photo
    DNA molecule, abstract scientific illustration.
    Winding Staircase, Vatican Museums — Stock Photo
    Winding Staircase, Vatican Museums
    Cross section of nautilus shell with spiral structure. — Stock Photo
    Cross section of nautilus shell with spiral structure.