The universe may be fine tuned not just for stars and galaxies, but for the simple act of liquid flowing inside a cell. A new study from Queen Mary University of London suggests that the fundamental constants of physics sit within an extremely narrow range that allows water, blood, and other biological fluids to behave in ways essential for life. Even a tiny shift in these constants could make blood too thick, water too sticky, or cellular motion impossible.
A hidden link between physics and biology
Researchers led by physicist Kostya Trachenko built on earlier work showing that liquid viscosity, the property that determines how easily a liquid flows, is directly tied to fundamental physical constants. That earlier work established a lower limit for how runny liquids can be. The new study, published in Science Advances, extends the idea into biology. It asks whether the same physical rules that shape the cosmos also quietly determine whether cells can function.
Life depends on movement at microscopic scales. Nutrients must travel through cells, proteins need to fold correctly, and molecules constantly diffuse through watery environments. All of this relies on viscosity. According to the researchers, the universe appears to operate within a surprisingly narrow bio friendly window where viscosity and diffusion remain suitable for life. If the constants governing physics shifted by only a few percent, liquids essential to biology could become dramatically thicker or thinner.
What a few percent change would mean
The team says the consequences would extend far beyond drinking water or oceans. Human blood, cellular fluids, and the chemistry that powers life all rely on carefully balanced flow properties. If water were as viscous as tar, life would not exist in its current form or not exist at all. The same applies beyond water, so all life forms using the liquid state to function would be affected. Any change in fundamental constants, including an increase or decrease, would be equally bad news for flow and for liquid based life. The window is quite narrow: for example, viscosity of blood would become too thick or too thin for body functioning with only a few percent change of some fundamental constants.
A delicate balance in the laws of nature
The study suggests that the universe's fundamental constants sit within an incredibly narrow sweet spot that allows liquids to flow properly inside living cells. This finding links the deepest laws of physics to the existence of life itself. The research was conducted at Queen Mary University of London and published in 2023. It builds on earlier work by Trachenko and colleagues that established a lower limit for liquid viscosity based on fundamental constants.
The discovery does not prove that the universe was designed for life, nor does it claim that life is rare or common elsewhere. It simply shows that the physical constants we observe appear to be finely balanced in a way that makes liquid based life possible. Whether that balance is coincidence, necessity, or something else remains an open question.
