Kennedy Space Center Water Flow Test at Launch Complex 39-B For SLS
Here's what 450,000 gallons of water looks like coming up through pipes at high speed. According to the video description, the water is used during spacecraft launches to protect the vehicle from the extreme acoustics and temperatures during ignition and takeoff.
Movie perception test
A very simple demonstration of change blindness from author Daniel Simons who co-authored the book The Invisible Gorilla.
I've been thinking about the ways in which my own memory works lately and I can definitely see myself incapable of accurately remembering information. It worries me sometimes and yes, I would have failed the test above if it were graded.