They're yours

All fourteen study cards, as printable PDFs.

  1. No. 01 · The knot count: twelve people, two thousand hairs
  2. No. 02 · The warning signs: 1,178 girls and women in Cape Town
  3. No. 03 · The wash-day survey: 201 caregivers, one question about flakes
  4. No. 04 · The wet-comb rule: one hospital sheet, one textbook line
  5. No. 05 · The satin question: one case report, no comparison
  6. No. 06 · The spring in the strand: single hairs, one minute in water
  7. No. 07 · The curl groups: three raters, 2,880 hairs
  8. No. 08 · The comb count: 480 strokes and two braiding groups
  9. No. 09 · The leave-on time: one guideline, no timed study found
  10. No. 10 · The lab-test notice: biotin, blood tests and two FDA warnings
  11. No. 11 · The ingredient count: 36 ingredients, 20 never trialled
  12. No. 12 · The hairline count: 1,042 schoolchildren, first year to last
  13. No. 13 · The shopping list: six things, two shops, one date
  14. No. 14 · The hair stories: ninety people, remembering

The full detail is in the guides.