Quantum Physics Wow

The Infamous Double Slit Experiment
I watched this to the end and my jaw dropped - it really blew my mind. Then I got to thinking, and I asked myself... what is that little eyeball thing? How is it looking for electrons? Is it firing a stream of some tiny particle out at that one electron and watching to see what bounces back? Is possible to "passively" look at an electron? Referring strictly to the end of this - what seems to be the conclusion there - my instincts tell me this situation is a bit more complicated than Dr. Quantum makes it seem.