The abundance of Lithium observed in very young stellar populations 
is ~ 4 times larger than the primordial one estimated by recent 
Planck measurements. Since Lithium is easily destroyed in stellar 
interiors, the search for astrophysical sources responsible for the 
observed Lithium over-abundance was a mystery for decades.  
In this seminar I'll discuss the detection of Lithium in the early 
spectra of the slow nova V1369 Cen, which can solve this problem, 
and then I'll discuss the consequences for the chemical evolution 
in the Galaxy.