I would have said "most expensive" rather than "most valuable," but I'm both nitpicking and snarking.
Interesting that Krypton isn't even named, and its fate and role in Superman's genesis gets exactly one panel.
I knew that Supes couldn't originally fly (from people explaining that "leap tall buildings" bit), but I didn't realize that his entire powerset consisted of being strong and tough. And not even all that tough, relative to modern superheroes--"nothing less than a bursting shell could penetrate his skin" made me chuckle.
So are we also looking at the origin of the fad of heroes wearing their underwear on the outside?