In this episode: diamond cutting technology; a collapsible 2-story trailer; how glass marbles are made; the Vultee Vengeance dive bomber.In this episode: diamond cutting technology; a collapsible 2-story trailer; how glass marbles are made; the Vultee Vengeance dive bomber.In this episode: diamond cutting technology; a collapsible 2-story trailer; how glass marbles are made; the Vultee Vengeance dive bomber.