There are still many challenging problems to be solved. From the point of view of propagation, multiple filaments and white light control are among these challenges. From the interaction physics point of view, a new direction in strong field molecular physics is being opened up. The latter is the consequence of the observation of clean fluorescence from molecules inside the filaments in air (Chapter 7). In the beginning of his conceptual thought, the author, through his previous extensive experience in multiphoton/tunnel ionization and fragmentation of molecules by intense lasers, proposed that all molecules in the high intensity inside a filament in air would be fragmented and the fragments would fluoresce.