As light goes through an interface, its speed changes. The solution for the behavior of light on one side of the interface or ...

One Vanderbilt University researcher thinks time travel might not just be for the movies. (Credit: Wikimedia Commons). Time ...

The origin of the arrows of time — sometimes called the master arrow of time — must thus be found in the history of our Universe, that is, in cosmology. This was already clear to Boltzmann.

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