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.

Musk's comments, addressing the existence of aliens and the viability ... this is like the Fermi Paradox, where are the aliens and I have not seen any evidence that there are aliens on earth.