Hand and yo-yo, coloured X-ray. Yo-yos are toys designed to be reeled out and back on the end of a string. The basic designs use just string and the p

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Hand and yo-yo, coloured X-ray. Yo-yos are toys designed to be reeled out and back on the end of a string. The basic designs use just string and the physics of spinning bodies, but more advanced designs use ball-bearings or springs (dark coils) to allow more control. At top, the X-ray has revealed the bones of the lower arm, wrist and hand.

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Size: 4163px × 4250px
Photo credit: © GUSTOIMAGES/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

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