  The electromagnetic probe is a very valuable tool to study the dynamics of
few nucleons. It can be very helpful in shedding light on the not yet fully
understood three-nucleon forces. We present an update on the theoretical
studies of electromagnetic induced reactions, such as photo-disintegration and
electron scattering off 4He. We will show that they potentially represent a
tool to discriminate among three-nucleon forces. Then, we will discuss the
charge radius and the nuclear electric polarizability of the 6He halo nucleus.
