The present changes the past? We are truly changing the past through the present. When I wrote a note about the speeding up of time, for me time began to flow much slower. Now I know the answer to the question why. It's all about the quantum fields that have woven our universe. Everything around is just a ripple of quantum fluctuations. Therefore, emptiness does not exist. This demonstrates the Unruh effect. Its description says: if you start to accelerate fast enough, then from the "void" will suddenly appear particles of warm gas. That is, the "emptiness" of the environment depends on the acceleration of the observer. And I, having learned that time has accelerated, I thus pushing to brake. How can this phenomenon be explained? The great physicist Wheeler conducted an experiment by passing photons (particles of light) through a Mach-Zehnder interferometer, emphasizing the wave nature of light. Thanks to the specular "splitter of rays", the device splits the quantum wave into two components moving in different paths. The second splitter then recombines the waves, causing an interference state, activating the light and wave detectors. And how the first signal is caught affects the result of the experiment. But here's what's interesting. If you remove the second element from this device immediately after the outgoing photon has transformed into a wave and into a particle, it will turn out that you have changed the past. By converting the photon back into a particle, although it was both a wave and a particle when splitting. In short, the experimenter can thus change the quantum past. Therefore, the more people think that time has accelerated, the more time will slow down. Precisely because our observation affects the quantum ripple. In fact, in this way it can be proved that measurements in the present can significantly affect the past. Rather, how a person perceives the very passage of time.