Can Gravity Leak from Alternate Universes?

Why does biro ink smell? How can you reset your tolerance to caffiene? Why can't my sat nav and my speedometer agree? We take on your science questions, as well as discover a lonely rogue planet and hear the DNA detective story that stopped an MRSA outbreak in its tracks. Plus, in our Question of the Week, we find out if menstrual cycles synchronise... Like this podcast? Please help us by supporting the Naked Scientists