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title: The Ship of Theseus
created: 2025-02-06T04:52:16
modified: 2025-12-16T10:34:07
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忒修斯之船 = Theseus’s Paradox 船舶悖論

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is a thought experiment and paradox about whether an object is the same object after having all of its original components replaced over time, typically one after the other.

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思考：

* 如果一艘船上的木板逐塊被替換，直到所有的木板都換成新的，那麼這艘船還是原來的那艘船嗎？
* 如果把舊木板收集起來，重新組裝成另一艘船，那麼哪一艘才是真正的「原船」？

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# Cell Regeneration

This can be applied to our [personal identities](your-identity-dictates-your-actions.md) as well. → 身體的細胞不斷地在更新，我們還是原來的自己嗎？

* [The average age of all cells in the human body is 7–10 years.](https://www.reddit.com/r/askscience/comments/1iuwniu/if_all_the_cells_in_your_body_are_replaced_every/)
* [Every seven years, human beings transform into entirely new versions of themselves. This idea stems from the biological principle that our bodies replace virtually all their cells over a seven-year cycle. The person you are today doesn’t share a single cell with the version of you from seven years ago.](https://www.questdiagnostics.com/patients/blog/articles/do-my-cells-really-change-every-7-years#:~:text=While%20it’s%20true%20that%20your,are%20replaced%20every%20few%20weeks.&text=In%20fact%2C%20you%20lose%20close,million%20skin%20cells%20every%20day.&text=Cells%20in%20your%20skeletal%20muscles,as%2015%20years%20to%20regenerate.)
* 不同細胞的更新週期
	* 🧠 神經細胞 (大腦) → 幾乎不會更新，大部分人一生都帶著同一批神經元 (但有少量例外，如海馬迴的神經元可能會再生) 。
	* 💀 骨細胞 → 約 10 年完全更新一次。
	* 🩸 紅血球 → 約 120 天更新一次。
	* 🧑‍🦲 皮膚細胞 → 約 2–4 週就會更新一次。
	* 🍽️ 腸道細胞 → 內壁細胞大約 2–5 天就會更新一次。
	* 💪 肌肉細胞 → 主要是修復而非完全更換，部分可持續數年。