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Jeffrey Wright is well known around his high school in Louisville, Ky., for his antics as a physics teacher, which include exploding pumpkins, hovercraft and a scary experiment that involves a bed of nails, a cinder block and a sledgehammer.

But it is a simple lecture — one without props or fireballs — that leaves the greatest impression on his students each year. The talk is about Mr. Wright’s son and the meaning of life, love and family.

It has become an annual event at Louisville Male Traditional High School (now coed, despite its name), and it has been captured in a short documentary, “Wright’s Law,” which recently won a gold medal in multimedia in the national College Photographer of the Year competition, run by the University of Missouri.

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The filmmaker, Zack Conkle, 22, a photojournalism graduate of Western Kentucky University and a former student of Mr. Wright’s, said he made the film because he would get frustrated trying to describe Mr. Wright’s teaching style. “I wanted to show people this guy is crazy and really amazing,” Mr. Conkle said in an interview.

The beginning of the film shows Mr. Wright, now 45, at his wackiest. A veteran of 23 years teaching, he does odd experiments involving air pressure and fiery chemicals — and one in which he lies on a bed of nails with a cinder block on his chest. A student takes a sledgehammer and swings, shattering the block and teaching a physics lesson about force and energy.

But each year, Mr. Wright gives a lecture on his experiences as a parent of a child with special needs. His son, Adam, now 12, has a rare disorder called Joubert syndrome, in which the part of the brain related to balance and movement fails to develop properly. Visually impaired and unable to control his movements, Adam breathes rapidly and doesn’t speak.

Mr. Wright said he decided to share his son’s story when his physics lessons led students to start asking him “the big questions.”

“When you start talking about physics, you start to wonder, ‘What is the purpose of it all?’ ” he said in an interview. “Kids started coming to me and asking me those ultimate questions. I wanted them to look at their life in a little different way — as opposed to just through the laws of physics — and give themselves more purpose in life.”

Mr. Wright starts his lecture by talking about the hopes and dreams he had for Adam and his daughter, Abbie, now 15. He recalls the day Adam was born, and the sadness he felt when he learned of his condition.

“All those dreams about ever watching my son knock a home run over the fence went away,” he tells the class. “The whole thing about where the universe came from? I didn’t care. … I started asking myself, what was the point of it?”

All that changed one day when Mr. Wright saw Abbie, about 4 at the time, playing with dolls on the floor next to Adam. At that moment he realized that his son could see and play — that the little boy had an inner life. He and his wife, Nancy, began teaching Adam simple sign language. One day, his son signed “I love you.”

In the lecture, Mr. Wright signs it for the class: “Daddy, I love you.” “There is nothing more incredible than the day you see this,” he says, and continues: “There is something a lot greater than energy. There’s something a lot greater than entropy. What’s the greatest thing?”

“Love,” his students whisper.

“That’s what makes the ‘why’ we exist,” Mr. Wright tells the spellbound students. “In this great big universe, we have all those stars. Who cares? Well, somebody cares. Somebody cares about you a lot. As long as we care about each other, that’s where we go from here.”

As the students file out of class, some wipe away tears and hug their teacher.

Mr. Wright says it can be emotionally draining to share his story with his class. But that is part of his role as a physics teacher.

“When you look at physics, it’s all about laws and how the world works,” he told me. “But if you don’t tie those laws into a much bigger purpose, the purpose in your heart, then they are going to sit there and ask the question ‘Who cares?’

“Kids are very spiritual — they want a bigger purpose. I think that’s where this story gives them something to think about.”

Mr. Wright says the lecture has one other purpose: to inspire students to pursue careers in science and genetic research.

“That’s where I find hope in my students,” he said. “Maybe if I can instill a little inspiration to my students to go into these fields, who knows? We might be able to come up with something we can use to help Adam out one day.”