In the extreme sport of bungee jumping, a daring athlete leaps from a great height and freefalls while a tethered cord tightens and stretches to absorb the energy from the descent. The bungee cord protects the jumper from serious injury, because its elasticity allows it to extend and provide a cushioning force that opposes gravity during the fall. Amazingly, nature also uses elasticity to dampe...

The human tail is perhaps the most exciting sign of a neural tube defect in skin. From appendix until creating 20 cm long tail-like lesions are reported this literature. They may occur associated with an underlying pathology condition such as lipoma or teratoma, but mostly, they hide spinal dissrafism. Here, we presenting case 5-year-old female who presented 18-cm tail, which hid till age becau...