  Understanding how galaxies formed their first stars is a vital cosmological
question, but the study of high-redshift objects, caught in the act of forming
their first stars, is difficult. Here we argue that two extremely
low-metallicity Blue Compact Dwarf galaxies (BCDs), IZw18 and SBS0335-052,
could be local templates for primordial star formation, since both lack evolved
($> $1 Gyr) stellar populations; but they form stars differently.
