In 2008, Celeste Mergens was working with an overcrowded orphanage on the outskirts of Nairobi, Kenya, when she learned that menstruating girls sat on cardboard in their rooms for several days each month. This set into motion a simple idea—combining a washable, long-lasting pad with taboo-breaking education—that became a catalyst for an unlikely global movement for equity. Written in short, evocative chapters, The Power of Days tells the story of Mergens's quest to rally a global response to elevate menstrual health, increase universal access to menstrual supplies, shatter stigma through education, and advocate for global policy change. Raised in poverty by a mentally ill parent, Mergens learned early on that building the life she wanted would take equal parts determination and humility, traits that led her to create the kinds of inclusive conversations and solutions she is known for around the globe. The challenges Mergens faced and the lessons she learned, personally and professionally, and the triumphs and resourcefulness of leaders all over the globe are illuminating to all who wish to make a difference and create a more equitable world. This enhanced audio recording features an audio-exclusive Q&A between Days for Girls cofounders Celeste and Don Mergens.