What if time is not as fixed as we thought? Imagine that instead of flowing in one direction—from past to future—time could flow forward or backwards due to processes taking place at the quantum level ...

Does time always flow in one direction? This perplexing question has captivated philosophers and scientists for centuries, ...

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.