No embalming?

So they don't really embalm the Pope any more than they need to in order to make it through the public viewing. Why not? It sounds like this has been their practice for a while, weird.

Also, the article talks about one of the past Popes -

"John XXIII's body was in excellent condition when it was exhumed from the cramped grotto under the basilica in 2001 - 38 years after his death - and moved to the main floor following his beatification."

I was under the impression that bodies began to decay within a few days even with embalming. Apparently I'm wrong. I know the Pope has a special 3-coffin system to prolong the body breaking down but who knew it could last 38 years. Maybe Mr. Pope has "special help" in his body staying in tact?