Professor Robert Matthews argued that the phenomenon is ultimately based in the fundamental physical constants. His reasoning was as follows. The height of the table from which a toast usually falls is directly related to the height of humans. Matthews proceeds to deduce the limits for a safe average human height from a simple chemical bond model: if a skull is higher than three meters from the ground, then a fall will lead to its fracture due to fracture of the chemical bonds after its acceleration under the Earth gravity. And here are the physical constants in question, quoting professor Matthews: "the electromagnetic fine-structure constant - determines the strength of the chemical bonds in the skull, while the second - the gravitational fine-structure constant - determines the strength of gravity. Finally, the so-called Bohr radius dictates the size of atoms making up the body.". For this work Mattews earned the 1996 Ig Nobel Prize in physics.