Feathers are one of evolution's cleverest inventions

Original Article ↗ Hacker News Discussion ↗

Accessing the article

  • Several comments share archive.is and Wayback Machine links, plus bookmarklet snippets to quickly open archived versions of any page.
  • People appreciate the convenience and describe different use cases: archives when a page won’t load, Wayback for version comparisons.

Feathers, flight, and evolution

  • Readers praise the article’s breakdown of feather structures and functions, and extend it with notes on owls’ silent flight and penguin-inspired swimsuits.
  • Discussion of birds vs other flying vertebrates: comparisons to bats, pterosaurs, flying squirrels, and insects (dragonflies, flies, etc.), including four-wing vs two-wing tradeoffs and wingtip inefficiencies.
  • Origin of feathers: insulation, communication, and water-repellency are mentioned as plausible pre-flight functions; multiple competing hypotheses for the origin of avian flight are linked, with no consensus.

Hair, nails, and developmental mysteries

  • Several threads dive into how hair and nails grow directionally and to specific lengths, and why some skin areas don’t grow hair.
  • Explanations center on growth cycles (anagen phases), timed growth vs length-sensing, follicle miniaturization, mechanotransduction, and environmental factors like shoe pressure.
  • Ingrown toenails and trimming techniques are discussed, with disagreement about mechanisms and best prevention strategies.

Bird physiology and extreme flight

  • The Bar-tailed Godwit’s nonstop 8,000+ mile migration draws attention; some note the article understates aircraft ranges.
  • Debate over whether godwits mostly flap continuously or must also exploit winds/updrafts; one side insists they’re pure flappers with high wing loading, the other argues energy math implies environmental assistance.
  • Bird respiratory systems are compared to “flow-through” designs; birds and dolphins’ unihemispheric sleep is mentioned as enabling long activity.

Evolution, “design,” and language

  • Large subthread on whether evolution is “random,” “clever,” or implies a designer.
  • Some emphasize random mutation but non-random selection; others argue teleological language (“invention,” “optimized,” “designed”) is misleading or tacitly theistic.
  • Creationist arguments question the probabilistic plausibility of complex organs, abiogenesis, and rapid evolution (e.g., chimp-to-human timescales); others rebut that such views misunderstand evolutionary dynamics.
  • Meta-debate on whether evolution is “science at its finest” or better seen as emergent, unsystematic trial-and-error.

Semantics and philosophy

  • Arguments about whether feathers are “inventions,” “discoveries,” or emergent phenomena; suggestions include using “emergence” for non-intentional complexity.
  • Some criticize anthropomorphizing evolution; others defend such language as a useful modeling shortcut.