Boundary Of Time

Where time begins...The beginning of forever. Why does time pass? The arrow of time from past to future only emerges when you take a step back from the microscopic world to the macroscopic – something first appreciated by the Austrian physicist-philosopher Ludwig Boltzmann. When you zoom in to the level of, say, one water molecule colliding and bouncing off another, the arrow of time disappears. If you watched a microscopic video of that collision and then you rewound it, it wouldn’t be obvious which way was forwards and which backwards. At the very smallest scale, the phenomenon that produces heat – collisions of molecules – is time-symmetric. Entropy only ever increases, never decreases - heat never flows from a cold body to a hot one. Time is the beginning of forever - forever is the beginning of time.