Man is in a transition stage; he has 31 pairs of spinal nerves which keys him to the solar month, but the nerves in the so-called cauda-equina - literally horse-tail, at the end of our spinal cord, are still too undeveloped to act as avenues for the spiritual ray of the sun.

'This is Spinal Tap' was a film we felt really had to be done like that. It wouldn't have worked any other way. And it turned out to be the first time a fiction film had really been made in a documentary format. I continued to do that, obviously, because it's a fun way to work.

I got really, really sick with a spinal infection that put me in a hospital for a couple of months, and it was touch and go. I had my guitar with me, and as soon as I got well enough to play, there was nothing else to do in that hospital. The nurses would come in and request songs.

As far as getting my start, it was really Norman Lear, even aside from being on 'All in the Family.' He helped me get my start as a director. He was the one who said, 'Let him do 'Spinal Tap.' Let him give it a try,' because I had been trying for years to get that thing off the ground.

My biggest 'Spinal Tap' moment was a stupid one as well. When we were rehearsing for the Zeppelin O2 gig, I was having an argument with my drum pedals. I actually took them outside, and drove over them several times with the car. Shouting at them and telling them they'll never work again.

Perhaps not unusually for a popular film produced over three decades ago, there have been a dizzying parade of corporate characters trading rights to 'This Is Spinal Tap' through the years. Yet our requests for timely statements of the film's income have been met with a series of slammed doors.

I had spinal surgery to correct scoliosis when I was 16 years old. The only thing that scared me about the procedure was that it would make me two inches taller. At the time, I had a crush on a boy who was about my height - and I was worried that if I were taller than him, it would never happen!

Mine's called leptomeningeal carcinomatosis. It's incurable. It's terminal. And it's in a tiny space - a huge area all around the brain and up and down the spine. But it's small area where the spinal fluid is. It's microscopic. You can't see it. It isn't lumps that they can say, 'Oh we can zap that.'

As computer intelligence gets better, what will be possible when we interface our brains with computers? It might sound scary, but early evidence suggests otherwise: interfacing brains with machines can be helpful in treating traumatic brain injury, repairing spinal cord damage, and countless other applications.

Your lower back contains numerous muscles. One group, called the erector spinae, attaches to your spinal column at different points along your back, allowing you to bend it forward and backward and from side to side. Toning these muscles helps prevent back pain, and it also tightens and firms your entire lower back.

To me, what I realized when we were doing 'Spinal Tap' - and the four of us wrote that - is, really, the core of that is the relationship with the two guys who grew up together and that strain when the girlfriend comes in. If that wasn't there, it's a very different movie. Then it's just bumbling guys stumbling along.

'Spinal Tap' began as a mock rock band that we four - Rob Reiner, Christopher Guest, Michael McKean and myself - developed for an appearance on a TV pilot at the end of the 1970s. On our own initiative, we wrote and recorded most of the songs and performed them live in several music clubs around L.A. before any cameras rolled.

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