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十万个为什么·科学阅读30篇(3)

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Why Do We Have Fingerprints?

Why Do We Have Fingerprints?

人为什么有指纹?

  1. Fingerprints form before birth in the womb.
  2. They are patterns of ridges and valleys on skin.
  3. No two people have the same fingerprints — not even twins.
  4. Ridges help us hold things better.
  5. They give more grip on smooth or wet surfaces.
  6. They also help us feel tiny textures and shapes.
  7. Police use fingerprints to identify people safely.
  8. Each finger has a unique pattern that never changes.
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