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== 2024.03.08 ==
== '''What is theory?'''<br/> &nbsp;==
A&nbsp;'''theory'''&nbsp;is a&nbsp;[https://en.wikipedia.org/wiki/Reason rational]&nbsp;type of&nbsp;[https://en.wikipedia.org/wiki/Abstraction abstract thinking]&nbsp;about a&nbsp;[https://en.wikipedia.org/wiki/Phenomenon phenomenon], or the results of such thinking. The process of contemplative and rational thinking is often associated with such processes as&nbsp;[https://en.wikipedia.org/wiki/Observational_study observational study]&nbsp;or research. Theories may be&nbsp;[https://en.wikipedia.org/wiki/Scientific_theory scientific], belong to a non-scientific discipline, or no discipline at all. Depending on the context, a theory's assertions might, for example, include generalized explanations of how&nbsp;[https://en.wikipedia.org/wiki/Nature_(philosophy) nature]&nbsp;works. The word has its roots in&nbsp;[https://en.wikipedia.org/wiki/Ancient_Greek ancient Greek], but in modern use it has taken on several related meanings.
#Stem cells do not age at the same rate; about one third od chronologically aged HSCs exhibit regeberative function similar to healthy young HSCs, coinciding with the health of mitochondria.
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=== Stem cell&nbsp; ===
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