Not to worry. This is not how engineers plan. 😛 The quality assurance department of engineering makes sure of that. It also ensures that all the problems the customers face get trouble shooted. Safe engineering practices are the basis of any new patent. This is just a fast-run video of a traffic signal, that definitely...
Learn and have fun watching how dynamics of the trusses work! These doors though a task to make can easily flourish in places which are cramped and cannot afford big wooden doors. A great work of engineering and art.
Might I warn you that this is what might happen on a date with an engineer! The things they study resonate in their minds and keep talking back to them. You might find your engineer friend looking at that frequency of the fan blades as you party. 😛
The derivative of e^x is e^x which means that the slope at any point on the line of graph e^x is equal to the value of the function at x. The integral of e^x is also e^x + constant. Which is amazing and mind boggling!