re: Parallel universes exist - study
I've long been a supporter of Hugh Everett's 'Many World' interpretation of quantum phenomena instead of the pedantic Copenhagen Dogma which explains nada.
An infinity of universes driven by each split photon or whatever quantum phenomena seems attractive and fun.
Maybe Roger Penrose is right and human intelligence and brains work on quantum events. Maybe we can even quantum direct ourselves into more 'favorable' universes on occasion. Think positively. It just might work.