1.   Cholla needles have small barbs at the end, not to mention a poisonous substance.

2.   However, he canceled the attempt because ultrasound pictures showed the needle would have to pierce the placenta before extracting any amniotic fluid.

3.   Sewing needles had to be air-cooled in order to puncture the tough material.

4.   While the overall color is dark green, the underside of the needles have a silvery sheen.