The nuclei in atoms and molecules move typically on femtosecond timescales (1 fs = 10-15
s). Electrons are moving much faster and may change their position on timescales down to attoseconds (1 as = 10-18
s). New experimental techniques allow to take movies of the electrons on this timescale and to gain deeper insight into the ultrafast dynamics of electrons in atoms, molecules and nanostructures.