Story of slaying of Raktabija by Kali & Durga | Why is Kali always shown with her tongue out

This video tells the reason behind why goddess Kali is always portrayed with her tongue sticking out.
This is the story of how the goddesses Kali and Durga come together to demolish the various asuras - Shumbha, Nishumbha, Dhumralochan and Raktabij.