  Viewed as one of the grandest questions in modern science, understanding
fundamental physical constants has been discussed in high-energy particle
physics, astronomy and cosmology. Here, I review how condensed matter and
liquid physics gives new insights into fundamental constants and their tuning.
This is based on two observations: first, cellular life and the existence of
observers depend on viscosity and diffusion. Second, the lower bound on
viscosity and upper bound on diffusion are set by fundamental constants, and I
briefly review this result and related recent developments in liquid physics. I
will subsequently show that bounds on viscosity, diffusion and the newly
introduced fundamental velocity gradient in a biochemical machine can all be
varied while keeping the fine-structure constant and the proton-to-electron
mass ratio intact. This implies that it is possible to produce heavy elements
in stars but have a viscous planet where all liquids have very high viscosity
(for example that of tar or higher) and where life may not exist. Knowing the
range of bio-friendly viscosity and diffusion, we will be able to calculate the
range of fundamental constants which favor cellular life and observers and
compare this tuning with that discussed in high-energy physics previously. This
invites an inter-disciplinary research between condensed matter physics and
life sciences, and I formulate several questions that life science can address.
I finish with a conjecture of multiple tuning and an evolutionary mechanism.
