Joe and Allan talk up the uses of duct tape and why we can't live with out it. Allan had to correct the installation of a door in a new building and Joe discovered a bad ventilation install from 72 years ago in his house. Max has questions about why atriums can be good things in some buildings. Joe has an insight into the thermodynamic properties of marble and other stone types used in homes for variety of reasons. They wrap up with the amazing Mississippi River Basin Model built outside of Clinton, MS. This amazing feature was used for decades to test and predict how the Mississippi river would flow.