Cannondale: What does the phrase four-cycle mean?
Santana: How is fuel and air mixed and moved into the combustion chamber at the right time?
Ibis: How does the burning air fuel mixture cause reasonably smooth motion of the output shaft that can be used to power a lawnmower or snowblower?
Burley: How is the air fuel mixture ignited (and at the right time)?
Co-Motion: How are the parts that contact each other, and are in motion with respect to each other, kept from wearing away?
Erickson: What keeps the engine from becoming so hot that it destroys itself?
Rodriguez: How do we get the engine running and how do we stop it?