Without synapses, your neurons wouldn't be able to communicate and your brain would be little more than a ball of meat. Exactly what synapses look like has been a mystery until now, and it turns out that even though their job is simple, they're complicated as hell.
You have trillions of synapses in your brain, and when you zoom in, each one is an insanely complex miracle of nature. A tiny biological switch with so much nuance it's mind-boggling. Using a number of techniques including Western blot, mass spectrometry, electron microscopy, and super-resolution fluorescence microscopy, German researchers were able to get a close look inside, and recently published their findings in Science.
What you see is a party of some 300,000 different proteins all hanging out in and on a single synapse. And there are trillions of those parties raging in your brain right now. The specifics of what they all are doing is, of course, super-complicated, but even someone with half a brain can appreciate how insanely complex our bodies really are. So exercise your synapses by pondering that.