The astronomical unit gets fixed

@article{Brumfiel2012TheAU,
  title={The astronomical unit gets fixed},
  author={Geoff Brumfiel},
  journal={Nature},
  year={2012}
}
Earth–Sun distance changes from slippery equation to single number. 

Analysis of Nucleosome Mobility, Fragility, and Recovery: From Embryonic Stem Cells to Invitrosomes

TLDR
Three separate hypothesis-driven investigations into nucleosome positioning and phasing within closely related cells lines yielded separate results, and a novel method was generated that significantly reduces data loss in in vitro nucleosite reconstitution experiments caused by nucleosom fragment-end bias.