Why are 48 fermionic degrees of freedom (6 quarks in 3 colors and 6 elptons) in the Standard Model? This fact may have surprising explanation by connecting the Standard Model to maximal (N=8) supergravity that necessarily has 48 fermionic degrees of freedom. In gauged supergravity both particle physics and gravity are in one unified picture. The scheme points to a mathematically virtually unexplored infinite group of symmetries E10.