{
  "name": "Reference objects for small sizes: hair, sand, fingerprint ridges, naked eye and light microscope",
  "desc": "Everyday reference sizes, one claim per row: human hair, sand grain class, fingerprint ridge breadth, and the naked-eye and light-microscope lines, with the condition each holds under.",
  "lic": "CC BY 4.0",
  "lic_url": "https://creativecommons.org/licenses/by/4.0/",
  "by": "Ants, Cells & Atoms",
  "url": "https://antscellsandatoms.com/scale/how-big-is-a-cell/",
  "from": [
    "values typed from the sources named in each row"
  ],
  "how": "Compiled by Ants, Cells & Atoms from the data listed",
  "data_by": [
    "Li C et al. 2023, Journal of Biomedical Optics 28(11):116501, CC BY 4.0, https://doi.org/10.1117/1.JBO.28.11.116501 (human hair; retrieved 2026-10-25)",
    "VanDusen BM, Fegley SR, Peterson CH 2012, PLoS ONE 7(12):e52694, CC BY 4.0, https://doi.org/10.1371/journal.pone.0052694 (sand class bounds; retrieved 2026-10-25)",
    "Fowler KD et al. 2020, PLOS ONE 15(4):e0231046, CC BY 4.0, https://doi.org/10.1371/journal.pone.0231046 (fingerprint ridge breadth; retrieved 2026-10-25)",
    "de Jong PTVM 2024, Eye 38(1):13-24, CC BY 4.0, https://doi.org/10.1038/s41433-022-02180-6 (one minute of arc, quoting Hooke; retrieved 2026-10-25)",
    "Valli J et al. 2021, Journal of Biological Chemistry 297(1):100791, CC BY 4.0, https://doi.org/10.1016/j.jbc.2021.100791 (lateral resolution limit, Abbe 1873; retrieved 2026-10-25)",
    "naked-eye size and 550 nm Abbe limit computed 2026-10-25 for this page with units carried at every step"
  ]
}