« In order to help “poor swimmers”, scientists developed “spermbots” that can deliver healthy sperm to an egg. The tiny metallic helices are just large enough to fit around the tail of a sperm. Their movements can be controlled by a magnetic field and lab testing showed they can deliver sperm to an egg for potential fertilization. « 

Source : https://www.youtube.com/watch?v=isRaHszrPc4