GUSTOIMAGES / SCIENCE PHOTO LIBRARY GUSTOIMAGES / SCIENCE PHOTO LIBRARY
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.
Model release not required. Property release not required.