Galaxies Under the Cosmic Microscope

Galaxy clusters magnify the images of distant galaxies that
serendipitously lie behind them.  This gives us the opportunity to
spatially resolve distant galaxies in a level of detail which would
otherwise require the increased light grasp and resolution of the next
generation of telescopes.  In this talk, I will present some recent
results which have exploited strong lensing to resolve the
star-forming regions in galaxies between z=2--5 on scales down to just
100pc, measuring their luminosities, masses and star-formation
efficiencies in order to compare their energetics with star-forming
regions seen in local galaxies.  These results provide an exciting
glimpse of the science that will be possible once ELT and ALMA reach
full science operations.