In lecture 4 part 1, we learned about what forensic engineers do when trying to assess a disaster. We learned that the factors that cause a problem to happen are usually from human error but can be due to weak materials or weather conditions. The presentation also says that there are "black swan" situations like the World Trade Center and the Titanic. These events are ones that were not expected and caused a massive impact on everything. In more detail, the slides to into what happened with the Titanic, which sank due to multiple reasons. The slides show us that there are many reasons behind why the Titanic sunk. It showed us that when poor material quality, material failure, and extreme conditions are applied to an engineered object, it will be subjected to a failure in some component.  The other event shown, was the Boston Molasses Disaster which was easily preventable. The reason this spill happened was because an loosely tested tank was filled with an amount that had never been carried before with a substance that was heated very quickly in a span of a day. Disasters like these could have easily been preventable if things were kept but to what they should be like in the event of the rivets of the titanic, and if things were thoroughly tested before use.