Humans have always wanted to change the past or future. However, as much as we might like to travel through time, this concept raises paradoxes (things that don’t make sense) and philosophical ...

The grandfather paradox is just one of the thorny logical problems that arise with the concept of time travel. But one physicist says he has resolved them.

Psychologist Steven Pinker believes we may be living in the most peaceful period in human existence ... The Violence Paradox takes a journey through history and the human mind to explore what ...