We are always works in progress. You will hurt people you love, and help people you detest. This is called being a human and it happens to everyone.

That's our job - to strap rockets onto everything.

There's this group online that I frequent. It's a group of prop crazies just like me called the Replica Props Forum, and it's people who trade, make and travel in information about movie props.

Let's get on our knees and pray. I don't know to whom. Is there a patron saint of ballistics gel?

These are people from everywhere, from Lawrence Livermore and JPL and Sandia National Labs, the FBI, all over the place, real scientists who see what we're doing, and they consistently thank us. "I agree your results aren't always right," they'll say, "but your methods are clearly showing that science is a re-creative process, and it's an interesting process because it's messy, and no other shows show that."

From earliest times, humans - explorers and thinkers - have wanted to figure out the shape of their world. Forever, the way we've done that is through storytelling. It is difficult to let the truth get in the way of a good story.

We don't necessarily stand by our faults every time, but we will always stand by our methodologies and ethos.