LOUISVILLE, Ky. — TestToob, an online community where young people can collaborate on science, was "born in the backyard and incubated on the kitchen table," its founder says. Now the promising Louisville startup is leaving the nursery.

The www.TestToob.com Web site is open for business, though still in its beta phase. And the company has been attracting attention.

TestToob received a $25,000 award from the state-funded Kentucky Enterprise Fund this year. On Sept. 25, its founder and chief executive, Lopa Mehrotra, will speak at the IdeaFestival in Louisville on "Changing the World: One Backyard Experiment at a Time."

To understand TestToob, think of YouTube for science fans. Geared for middle school and high school students, the TestToob site lets members post videos of their science experiments, view science videos posted by other students and rate them. In coming months, it will add more features of social-networking sites such as Facebook and MySpace, with avenues for sharing personal information, posting photos and participating in forums.

The idea for the business came last year, said Mehrotra, who moved to Louisville five years ago. The mother of two said she was "looking for a way to integrate technology and education" and for measures that could make science education more appealing.

First she considered a television show on "kids in Kentucky doing science in their own backyard," said Mehrotra, 37. The problem was, "TV is so expensive, and ... I don't even know if anybody watches TV anymore."

Mehrotra decided on another approach one day in August of last year, when she saw her daughter Ariana, then 6, in their backyard "playing with a couple of rocks."

"She said, 'It's amazing, Mom. If I scratch these gray rocks, they turn white. It's like magic,' " Mehrotra recalled.

Mehrotra ran for a video camera and recorded Ariana describing her observations.

"She had this whole vision about it and was so excited to tell me," Mehrotra said. "I thought immediately about all the social networking applications — YouTube and Facebook."

Ariana's sister, Ayala, then 4, said: " 'That looks easy. I want to do it,' " Mehrotra said. "So then we did a video for her."

Mehrotra, who has a background in political management and fundraising, tested the concept on other children and found them equally enthusiastic. Despite its high-tech wrappings, the concept appeals to basic human nature, she said.

"We often think that these social networking technologies are forcing behaviors that are weird or technology-driven. But it turns out it's just how human beings interact. We create. We want to share it. And when we see what somebody else has done, we want to imitate it."

TestToob was incorporated in October, and Mehrotra "just started preaching it to anybody who would listen." She soon found financial backing from an investor and began developing the business plan and the software the operation would need.

In one of its first real-life tests, TestToob took part in the Junior Achievement of Kentuckiana summer Bizcamp. Each day, camp students conducted and recorded a science experiment and posted the videos to TestToob's Web site.

"The kids were just fascinated by it," said Debra Hoffer, president of Junior Achievement of Kentuckiana. "I think the more that we can put kids directly in touch with scientific experimentation, the more we're going to pique their interest in science as a career."

TestToob was also in use recently at Assumption High School in Louisville, where chemistry and physics teacher Dan Dykstra's students recorded an assortment of short chemistry demonstrations.

"A great way to engage them in doing science is to take advantage of technologies that they're already using," Dykstra said. The videos from the site also will be handy for reviews when students miss class, he said.

"I was excited," senior Megan Fleming, 17, said after the videos were recorded. "It was something really different."