Can you tell me the story of how the Ganga and Yamuna flowed from Sai Baba's feet?

Yes, this incredible event is described in Chapter 4. The devotee Das Ganu felt a strong desire to bathe in the holy Prayag, the confluence of the Ganga and Yamuna rivers, on a special holy day. When he went to ask for Sai Baba's permission, Baba advised him against traveling far, stating, "This itself is our Prayag; keep firm faith in your mind." In a miraculous display, as Das Ganu bowed to Baba's feet, water representing the sacred Ganga and Yamuna began to drip from Baba's two big toes. Witnessing this leela, Das Ganu was completely overcome with emotion and love for Baba, and the experience inspired him to compose a song praising Baba's unfathomable power.