Weak (Radioactive) Interaction:
Power and Longevity of the Sun

If 6 kinds of quarks and 6 types of leptons, Why only see up and down quark and electron?
Weak interactions cause massive quarks and leptons to decay into lighter quarks and leptons

weak interactions cause quark or lepton to transform via W+, W-, and Z force carrying particles

Why is sun 4.5 billion years old? 
slowness of weak interaction 
Where does it get its power? 
nuclear fusion converting mass to energy... 
ultimate source of all our energy

pp -> (pn) e+ n=d e+ n
            d= deuteron = 2H11 = n+p