Why do room temperature liquid metals (LMs) have such high electrical conductivity? Mott et al, 1934 had proposed the idea of higher free electrons but what is the particular characteristic of LMs that cause such high free electron generation? Bosch et al, 1975 pointed that as the d-band becomes more than half-filled or more than half-empty the d-electron contribution to the electrical conductivity decreases. There are many such speculations however, the underlying mechanism of liquid metal conductivity is still blurred.