Unlocking the mysteries of the ice ages

@article{Raymo2008UnlockingTM,
  title={Unlocking the mysteries of the ice ages},
  author={Maureen E. Raymo and Peter J. Huybers},
  journal={Nature},
  year={2008},
  volume={451},
  pages={284-285}
}
Much progress has been made towards understanding what caused the waxing and the waning of the great ice sheets, but a complete theory of the ice ages is still elusive. 

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