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2:01
What Recker does during this growing period will change the structure of his brain.
1:30
The story of how our body deals with damage and repair can be told through Kate's feet.
1:42
We learn to work together by reading the emotions and facial expressions of others.
1:56
Danny demonstrates how new motor skills must be learned and developed with practice.
0:53
Freya's bones in her racket arm have become thicker to cope with her intense workouts.
