  Jets from radio galaxies can have dramatic effects on the medium through
which they propagate. We review observational evidence for jet-induced star
formation in low ('FR-I') and high ('FR-II') luminosity radio galaxies, at low
and high redshifts respectively. We then discuss numerical simulations which
are aimed to explain a jet-induced starburst ('Minkowski's Object') in the
nearby FR-I type radio galaxy NGC 541. We conclude that jets can induce star
formation in moderately dense (10 cm-3), warm (10,000 K) gas; that this may be
more common in the dense environments of forming, active galaxies; and that
this may provide a mechanism for 'positive' feedback from AGN in the galaxy
formation process.
