time travel

In the peer-reviewed journal article, University of Queensland physicists say time is essentially self-healing. Changes in the past wouldn't necessarily cause a universe-ending paradox. Phew.

Rather than the time travel or war, the thrill of Amal El-Mohtar and Max Gladstone's book becomes the connection between two lonely professional killers with the ability to inscribe letters on lava.

If the history of thermodynamics can teach us anything, it is that modest entropy reversals have not taken us back in time at all. But it is more fun to think otherwise, says guest Jimena Canales.

Putting humans and consciousness aside, at the level of quantum particles, Wheeler's delayed-choice experiments show that actions in the present can influence the past, says physicist Marcelo Gleiser.