What are the design drivers now to innovate further?

Yeah.

So the design drivers are making more and more efficient or effective heat exchangers.

That's really the foundation of Sterlings in general is you have various heat exchangers within the engine and you need those to operate at as high efficiency as possible.

The more efficient they are, the more efficient the entire system is.

So to give you an example of a couple of them, so There is a heat exchanger between where we react fuel and how you transfer that fuel into your, or I'm sorry, how you transfer that heat into your working gas.

So I gave you that like balloon example with the helium inside.

So I think our audience will understand most of what goes on in a Metal AM machine, but touch on that a little bit, what's going on inside the machine and then what happens before that, if anything, after the design and what happens in terms of post-processing once the parts are out of the machine.