Well, it is not really a question; for a start.
I would say someone was bored and was hitting goggle; typing 'hot to make a simple...'. Just then words, time machine, popped into existence; as the real thing would do so, be it from the past or the future. Having clicked on the link and found some nutter showing an oscilloscope with two waves crossing the screen and a strange explanation of how they are behaving. So the bored one, thought they would share.
I want to see the oscilloscope image frozen after the 1st wave. I would say just before the first wave completes, the second wave starts and because it is reoccurring, it give an optical illusion of the second wave, starting before the first.