Claude Shannon (1916–2001) proved that Boole’s abstract logic could be mapped directly onto physical electrical circuits. In his 1937 master’s thesis — frequently called the most significant thesis of the century — he showed that a series of electrical relays (switches) could perform the logical functions of AND, OR, and NOT.
This was the “missing link”. By showing that electricity could “think” in binary, Shannon paved the way for the electronic digital computer, by revaleing that that the flow of an elcetrical current could be used to process the logic of the human mind.