The spin Hall effect is a relativistic spin–orbit coupling phenomenon that can be used to electrically generate or detect spin currents in non-magnetic systems. In a Physical Review Letters paper we have introduced an experimental and theoretical work in this field, performed by our international Prague-Nottingham-Cambridge-Texas group. We succeeded in demonstrating electrical spin-injection into a non-magnetic semiconductor combined with electrical detection by the inverse spin Hall effect in an Fe/GaAs microdevice. Electrical spin injection and detection complemented in our microdevice with an applied electrical drift current to control the spin distribution and spin current in the channel. The structure represents a realization of a new type of an all-electrical spin transistor/modulator device. In an invited review article published in a special issue of Nature Materials on Spintronics we mentioned this new work along with the series of studies by our group and other groups in the world that, since the first experimental observation of the spin Hall effect less than 10 years ago, have established the basic physical understanding of the phenomenon and the role that several of the spin Hall devices have had in the demonstration of new spintronic functionalities and physical phenomena.