So, if I understood it correctly, the second story implies that Rinnosuke is actually Marisa's father (or at least I feel like the shopkeeper's child was her. It would explain the alleged feud between them). Quite an interesting take on the possible relationship between Marisa and Rinnosuke.
Page 11 is a bit unfair to the Wright brothers. They were largely self-taught, true, but they were accomplished engineers and pioneering aerodynamicists, not just a couple of jabronis who built bicycles.