A man who invented prosthetic balls for dogs won an Ig Nobel Prize for it last night.

Gregg Miller mortgaged his home and maxed out his credit cards to mass produce his invention — prosthetic testicles for neutered dogs.

What started 10 years ago with an experiment on an unwitting Rottweiler named Max has turned into a thriving mail-order business. And on Thursday night Miller's efforts earned him a dubious yet strangely coveted honor: the Ig Nobel Prize for medicine.

"Considering my parents thought I was an idiot when I was a kid, this is a great honor," he said. "I wish they were alive to see it."

The Ig Nobels, given at Harvard University by Annals of Improbable Research magazine, celebrate the humorous, creative and odd side of science.

Miller has sold more than 150,000 of his Neuticles, more than doubling his $500,000 investment. The silicone implants come in different sizes, shapes, weights and degrees of firmness.

The product's Web site says Neuticles allow a pet "to retain his natural look" and "self esteem."

Somehow I think the dog would be even more humiliated. Read on for previous Ig Nobel winners.

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This year's other Ig Nobel winners include:

• PHYSICS: Since 1927, researchers at the University of Queensland in Australia have been tracking a glob of congealed black tar as it drips through a funnel — at a rate of one drop every nine years.
• PEACE: Two researchers at Newcastle University in England monitored the brain activity of locusts as they watched clips from the movie "Star Wars."
• CHEMISTRY: An experiment at the University of Minnesota was designed to prove whether people can swim faster or slower in syrup than in water.

The Ig Nobel for literature went to the Nigerians who introduced millions of e-mail users to a "cast of rich characters ... each of whom requires just a small amount of expense money so as to obtain access to the great wealth to which they are entitled."