1) The document summarizes research on measuring the initial-final mass relation (IFMR) of stars, which relates the initial mass of a star to its final mass after evolution into a white dwarf. 2) The research involves finding white dwarfs in star clusters, measuring the clusters' ages and masses of progenitor stars, and obtaining spectroscopic properties of white dwarfs to determine their masses and ages. 3) Key results are that lower-mass stars like the Sun lose 46% of their mass, while more massive stars lose up to 80% of their mass during evolution according to current measurements of the IFMR.