LHAASO detects showers at 4410m above sea level. Multi parameters, such as energy, muon-content, Xmax, direction and arrival time, are well measured with full containing both longitudinally and laterally. 

This enables separation of specific species of showers from others event by event. 

For gamma rays, the all background CR events are thrown away by a factor of 10^5 thus yielding a nearly pure gamma ray samples above 100 TeV. LHAASO has been finding PeVatrons in the Milky Way 

What would we give to see an even younger image of the Universe from relics of the Big Bang?  And how can one even imagine how to do that?  One of the most subtle and important discoveries in elementary particle physics was to find that the tiny neutral particles that Enrico Fermi called the neutrinos have mass.  This mass was discovered indirectly through an effect predicted by Bruno Pontecorvo, now probed to high precision by KM3Net.