  Recent experimental results in three-body systems have unambiguously shown
that calculations based on nucleon-nucleon forces fail to accurately describe
many experimental observables and one needs to include effects which are beyond
the realm of the two-body potentials. This conclusion owes its significance to
the fact that experiments and calculations can both be performed with a high
accuracy. In this short review, a sample of recent experimental results along
with the results of the state-of-the-art calculations will be presented and
discussed.
