Although abundant in nature, the color blue is notoriously hard to create as a dye. In fact, the process behind indigo's transformation from parasitic shrub to precious stain is still only partially understood by scientists. Catherine E. McKinley tells the pigment's fascinating story here, winningly weaving into her historical researches a personal narrative illuminating her own tangled heritage, which has uncanny ties to the fabled hue.

April 24: "[The HST] lifted a curtain from our view of the universe, changing it so profoundly that no human can look at the stars in the same way..."

Kenneth Calhoun (Black Moon) and Lysley Tenorio (Monstress) of the Discover Great New Writers program on B-movies, heritage, and finales.