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Sia video features child karate master with Olympic dreams

She has a soft spot for Duffy the Disney Bear and her favorite food is chocolate. She does her homework before dinner but really loves skateboarding, playing video games and bouncing on her trampoline.

If Mahiro Takano sounds like any 9-year-old, think again: The third grader from Niigata, a rice-growing region in Japan, stars in Sia's latest music video "Alive," the just-released single from the singer's upcoming album.

In a backdrop of stark gray, the girl, wearing a white and black wig evocative of Sia's hairstyle, performs a dazzling routine with quick fists and kicks, and an adorably determined concentration of energy.

Mahiro, a three-time Japan...