  We present an argument reinterpreting the generalized uncertainty principle
(GUP) and its associated minimal length as an effective variation of Planck
constant ($\hbar$), complementing Dirac's large number hypothesis of varying
$G$. We argue that the charge radii (i.e. the minimal length of a scattering
process) of hadrons/nuclei along with their corresponding masses support an
existence of an effective variation of $\hbar$. This suggests a universality of
a minimal length in measurement of scattering process. Varying $\hbar$ and $G$
explains the necessity of Von Neumann entropy correction in Bekenstein-Hawking
entropy-area law. Lastly, we suggest that the effective value of $\hbar$
derived from various elements may be related to the epoch of their creation via
nucleosynthesis.
