Overlord and berserk have adult protagonists, though overlord he is an undead but he did used to be a salary man. Guts is at least a legitimate adult. That said I do agree with you, it’s frustrating that everyone is in highschool.

Because we live in the real world and no amount of hope and dreams will change physics. We aim for the large rockets because they are possible with the technology we have now. Things like space elevators are not possible with current or near future technology. Things that use even near future technology are at least…

I thought phossy jaw was from poor handling of phosphorus. Radium jaw is just gangrene.