Early cosmic epochs are characterized by low metallicity and high specific star-formation rates. These conditions are dominated by massive-star feedback that may be dramatically different than the traditional model dominated by hot, thermal superwinds driven by supernova explosions. Instead, metal-poor feedback from massive stars may be radiation-dominated, with weak mechanical feedback, possibly aiding the escape of Lyα and Lyman continuum radiation. I will describe our understanding that is emerging from observations of starburst galaxies in the local universe.

Dust plays an important role in our understanding of the near and distant Universe. The enormous amounts (≳108M⊙) of dust observed at high redshifts have forced us to revisit the commonly-invoked sites of dust production. Although core-collapse supernovae are the prime candidates for cosmic dust production, their actual contribution to the dust budget has been the subject of much debate in recent years. Here, I will discuss results from several vigorous observational campaigns aimed at quantifying the amount of dust produced by core-collapse supernovae. Although sample sizes are still modest, I will attempt to put the role of supernovae as dust producers into perspective.