hello. I have read a lot of information about time dilation, the twin paradox, the doppler effect and the lorentz transform, but, because I am not a physicist, I have to confess that I understand time dilation only partially. On the internet there are lots of examples that go with the theoretical explanations. (eg. http://www.phys.unsw.edu.au/einsteinlight/jw/module4_time_dilation.htm or http://www.walter-fendt.de/ph11e/timedilation.htm). There is this example of the 2 clocks that are synchronized. One of them stays on the earth, the other is placed on a spaceship that travels at near-lightspeed. Both of them work with a light beam that bounces off a mirror. The basic idea is that the clock on the spaceship ticks slower, because it takes the lightbeam more time to bounce off the mirror. There is also the case of the twin paradox that is brought into the discussion. Now you’ll have to excuse my childish ignorarace: for me these examples only demonstrate that at relativistic speeds a light beam clock ticks slower, not that time itself goes slower. As for the twin paradox, why does the twin brother who travels on the spaceship age slower than the one on earth? In what way are the biological processes slowed down? Is that because the particles of the atoms that make up the human body are also slowed down, just like the light beam? it is known that for an object that travels at a certain speed time goes slower than for an object that stays still. So I would like someone to explain to me the relationship between speed and time dilation. If this has also to do with light or the speed of light, then I would like to get an explanation about the relation between time dilation and speed of light… thank you in advance!