YouTuber AlphaPhoenix pulled off something that sounds impossible.
He recorded a laser moving across a room at 2 billion frames per second.
That is fast enough to watch light itself travel, something the human eye can never perceive in real time.
The camera he used was not a normal high speed camera. It recorded only one pixel at a time.
To build a full video, he fired the laser again and again, each time recording a single pixel from a slightly different point.
After thousands of captures, he stitched the pixels together into a full frame sequence that reveals the light wave moving through space.
It is a mind bending mix of physics and creativity.
The end result lets us watch one of the fastest phenomena in the universe at a speed we can finally understand.