He'll rush through each subject without taking time to clarify all the the details and reasons. The custom to avoid bread-ends apparently started in the days when many people were too poor to afford their own oven, and townspeople would bring their dough to a large communal oven to bake. In order to conserve space, they placed the doughs end to end, and often the bread stuck together. As a result the end part was not well-baked and therefore not eaten. Commercial bakeries today often bake in the same way, and if you notice you can see where the loaves were pulled apart.
Some bakeries put doughs side by side and they stick together on the sides.
It would follow, then, that the side should not be eaten. The reality is that both the ends and the sides are almost always completely baked, and there's no need to protest if someone eats them. Dear Uri, The Mashiach is a king descended from David who will eventually restore Davidic rule. As far as the actual day of Mashiach's arrival, it's been a shrouded secret since time immemorial. Jacob knew prophetically, but when he sought to reveal it to his 12 sons, he was mysteriously unable.