Time Travel Not Likely - Pear Shaped Nucleus Says So! Maybe!

Physicists have confirmed the existence of a new form of atomic nuclei, and the fact that it’s not symmetrical challenges the fundamental theories of physics that explain our Universe.  For one, it means that time travel into the past is not possible.  However, the good news is that the discovery could help scientists solve one of the biggest mysteries in theoretical physics - where is all the dark matter?

Read the full story at Science Alert.