Traditionally, human procreation is all about accuracy through volume. Fire enough sperm at an egg (200-500 million is about average for a single, um, event), and if you’re lucky, a few of them (maybe a hundred or so) will eventually figure out the right thing to do, and one of those might end up leading to a successful fertilization. These are horrible odds, and it’s vaguely amazing that we manage to keep on making more of ourselves at all.
One futuristic approach (which has already been adopted by some of the more primitive insects) is to do away with the hundreds of millions of sperm, and rely on just one to get the job done. If you’re going to do that, your one sperm needs to be incredibly awesome, and thanks to science, it can be. Researchers from the Institute for Integrative Nanosciences at IFW Dresden in Germany have successfully tested tiny, magnetically-driven power suits for individual sperm that can turn them into steerable cyborg “spermbots” that can be remote controlled all the way to the egg.