Find that everyday highway overpass bridges are more interesting than they appear. These ubiquitous structures deserve to be admired for their simplicity and practicality. Plunge into the principles of multi-girder spans, and learn that new construction techniques make highway bridges more efficient and elegant than ever.

In the first of four lectures on your house as a technological system, review the eight engineered subsystems that go into modern dwellings. Then discover the miracle of building codes, which ensure that every new house is safe, constructible, and reasonably economical without involving an engineer in each design.

Plunge into hydraulics, learning how force is transmitted from actuators to hydraulic cylinders through fluid-filled lines. Then use this knowledge to design and build a hydraulically powered mechanical arm that can grasp and manipulate a concrete block - controlled by four hand-operated syringes. Along the way, use 3D printing to fabricate several crucial parts.

How much energy can you save with a properly designed house? Would you believe all of it? Trace the trend in passive solar and net-zero-energy homes that are engineered to stay comfortable year-round by exploiting sunlight in winter and shielding against it in summer, with minimal operating costs.

Get a taste of electrical engineering by designing and building an electric launch controller that will ignite your rocket engine safely. Design a circuit that meets all code requirements. Use Ohm's law to determine the number of batteries and type of resistor required. Also, get a lesson in proper soldering technique for assembling the circuit.

What happens when you encounter a noteworthy structure that hasn't been included in this course and you want to know more about it? Professor Ressler devotes his final lecture to answering this question; sending you out into the world with suggested strategies for understanding any structure - great or otherwise.

Unravel the secret of refrigeration by focusing on the connection between heat, temperature, work, and energy. Then see how these thermodynamic concepts apply to the vapor-compression cycle in your refrigerator or air conditioner. Discover that a heat pump operates the same way.

Now that you understand the forces your cardboard tower must withstand, conduct a series of compressive and tensile strength experiments to determine the size and shape of your structure's beams, columns, and braces. After completing your design, build the tower using ordinary wood glue and simple tools. Then pile on concrete blocks and marvel at the strength of your creation.

The need for roofs spanning large enclosed spaces led to a startling number of new structural systems in the last 200 years. Look closer at long-span structural configurations in places such as the Houston Astrodome, the Berlin Hauptbahnhof, and even the Hartford Civic Center (the collapse of which offers a lesson in the risks of innovation).

Delve into tunnel engineering, a discipline every bit as impressive as bridge building, only less visible. Consider the challenges presented by the type of soil or rock being excavated for a tunnel, marvel at the work of mammoth tunnel boring machines, and weigh the tradeoffs between tunnels versus bridges.