Sam Massa, 18, started a business to convert diesel-powered vehicles to run on vegetable oil.

Don’t look away. We are going to talk about oil prices. But it’s positive, I promise. This “pain at the pump” story starts with a dyslexic student who had a hard time in high school.

Sam Massa had such a hard time with dyslexia, he eventually dropped out of high school to get his GED and pursue his independent spirit of entrepreneurship. He started small with mowing lawns then he started a DJ company, eventually making enough money to buy his dream car — a yellow Hummer.

Gasp! Here comes the gas prices part — Sam couldn’t afford the gas to keep up the Hummer. So, he started a business, Massa Green Enterprises, to convert diesel engines to run on veggie oil. He tours with his Hummer across the country, filling up with leftovers from fast food restaurants. How will the story end? Sam, 18, hopes it will get more people talking about veggie oil prices.

What would you like to ask Sam? Post your questions here or at iReport.com and tune in to CNN.com Live Friday at 3:30 p.m. ET for my interview with Sam.

Catherine Cook, 18, is seen here with brother and cofounder of myyearbook.com, Dave Cook, along with their brother Geoff Cook.

The story of Megan Meier is unforgettable for me and many of our viewers, no doubt; a 13-year-old girl who killed herself after being harassed online. As I kept reporting the horrific details, I wondered about a solution. It turns out 18-year-old Catherine Cook was thinking the same thing.

Catherine started myyearbook.com, the third largest social network in the United States, according to Hitwise, a competitive intelligence service. Reaching out to young people online, she decided to spend the month of June educating and acting to stop cyberbullying. So far, some 200,000 teens have pledged to “think before they click” and learn how to respond if they are the target of a cyberbully. Catherine hopes to have 1 million people sign the pledge in 2008.

“While nothing can bring Megan back, knowing that 1 million young people will take a pledge against cyberbullying in her name gives me hope,” says Tina Meier, Megan’s mom.

Update: Watch the CNN.com Live interview

Ayna Agarwal, 15, founded Stop Animal Overpopulation Together Globally.

Ayna Agarwal will never forget the day she was visiting her family in New Delhi, India and she saw a helpless dog in the street. It was like so many she had seen there with infections, disease and missing paws. But, it was the last one she wanted to see without doing something about it.

Ayna started SPOT, or Stop Animal Overpopulation Together Globally, to spay and neuter cats and dogs worldwide, specifically in third-world countries. She sits on the board of The Humane Society’s youth division, Humane Teen, where she represents her passion for animal population control with other young people who are concerned with different issues like animal cruelty and fighting fur production. Trying to impart the issues she discusses there with others in her hometown of Edison, New Jersey, Ayna is now running a summer camp called Paws and Claws to educate kids in grades 3-5 about animal welfare and protection.

At 15, Ayna knows exactly what she wants to be when she grows up — a veterinarian and animal activist. She says she would like to eventually “speak for the animals because they can’t speak for themselves.”

Update: Watch the CNN.com Live interview

Aaron Arnold, 29, is the founder of Music is My Business.

No matter how old we are, no matter what stage we’re at in life, we all tend to wonder, “If money didn’t matter, what would I do?” Aaron Arnold had those thoughts. And he’s acted on them.

After Arnold graduated from college, he was fast-tracked into an executive position at a major PR firm. He had money, but he was miserable. The real answer to his nagging thoughts about his true passion was music. So shortly after he got married, Arnold took a major leap to a nonpaying (to the dismay of his wife) internship with Bad Boy Records.

He worked for free to soak up all he could as an assistant to record producer and entrepreneur Sean “Diddy” Combs. After a year of grooming, the 29-year-old went on his own to start Music is My Business. “I wanted to change the music industry for the better,” Arnold said. He now handles budding artists, with the goal of changing the way business is done in the music industry.

Update: Watch the CNN.com Live interview

Tiffany Tucker, 25, is the founder of Redemption, a youth empowerment organization based in Brooklyn, New York.

Tiffany Tucker’s smile beats her into any room. Her smile gets even brighter when she says, “the door is always open!” That door refers to one that goes into her brainchild, Redemption.

She thinks everyone in her community in Brooklyn, New York, including herself, deserves the chance to be saved or rescued. Tucker, 25, was raised by a single mom, and she knows that New York City’s streets can be mean. But she didn’t let them swallow her, and if it’s up to her, no other young person will be swallowed, either.

Redemption promotes self-esteem and leadership skills for kids 13 to 19 years old. Tucker’s program has offered more than 3,000 urban kids and teens life skills workshops, college coaching and one-on-one counseling. According to Tucker, her open-door policy has led to a huge success rate: 85 percent of students in the mentorship program have graduated from high school and signed up for higher education.

Update: Watch the CNN.com Live interview

Zac Sunderland, 16, plans to sail around the world in a boat that he and his father fixed up.

Some dreams, it seems, probably will remain just that: distant, whimsical, cinematic adventures. That’s what you probably think when “sailing around the world” comes to mind. Not so for 16-year-old Zac Sunderland.

Zac wants to set a record for being the youngest person to sail around the world solo, and he hopes to complete the journey before he turns 18. He grew up sailing and is about to set off on a well-researched trip that will take him to Micronesia; Cape Town, South Africa; and through the Panama Canal in a boat he fixed up with his dad.

Throughout his journey, Zac will be blogging. Aside from his dad meeting him at strategic locations along the way, Zac will be alone. He will have a gallon of teriyaki sauce he’s already bought in anticipation of catching his meals, along with malaria drugs, a gurney-like bed and, after it’s all over, he hopes, a record.

Update: Watch the CNN.com Live interview

Operation Fairy Dust helps high school girls prepare for prom night when they otherwise couldn't afford to do so.

Prom. They say you never forget the day, good or bad. The date. The hair. The makeup. The dress.

But many young girls can’t afford to get all dolled up. Enter Operation Fairy Dust. Founded in 2002, this group was built by young female professionals and graduate students in New York City. It provides high school girls with makeup, accessories and prom dresses, if they can’t buy them on their own.

With sister organizations around the country, these groups sustain themselves with donations and second-hand dresses. The young women who run the group wear tiaras and are as cheerful as they are kind-hearted. They can’t promise a good time, but they can provide the means to have a fair shot at having one.

Update: Watch the CNN.com Live interview

Half of the proceeds from the teens' 'Polar Bear Gear' help fund a program that sends kids to the Arctic North.

This week we heard big news from Washington: Polar bears are now listed as “threatened” and have additional protection under the Endangered Species Act. But before the Department of Interior’s national call to action, a set of triplets in Maryland were taking action in their own way.

Sixteen-year-old Connor, Hayley and Emma Gilbert started Polar Bear Nation. The teens partnered with Polar Bears International last year to help fund a program that sends kids to the Arctic North. PBI’s Adventure Learning Camp creates Arctic Ambassadors, or students who educate other young people on climate change and its effect on polar bears.

The triplets are busy selling their “Polar Bear Gear,” with half of the proceeds going to scientific research and outreach programs at PBI. Certainly they are happy about the news this week. But, the Gilbert teens are quick with a list of facts pointing to their conclusion that a lot more has to be done for the bears.

Update: Watch the CNN.com Live interview

Alicia Mixson takes care of her brother Catlin Mixson, who was hit by a roadside bomb in Iraq last year.

The Mixson family has two young heroes. Catlin Mixson, 21, is one of the nation’s heroes, serving in Iraq until he was wounded. And Alicia Mixson, 26, is his hero, putting her own life on hold to take care of her brother.

Catlin was hit by a roadside bomb in Baghdad eight months ago. Everyone else in his Humvee died. Catlin survived, but had to have both legs amputated. Doctors wanted someone to stay at the military hospital in Texas with him. Alicia left everything she had in Florida to care for him.

They live in Army lodgings together now. She takes him to rehab, counts his pills and rolls his wheelchair. “People keep telling me that it’s exceptional – but in my heart I didn’t have a choice,” says Alicia, a truly unsung hero.

For her selfless work, Alicia was recognized by CVS Pharmacy’s “For All the Ways You Care” program.

Update: Watch the CNN.com Live interview

Kate Atwood, second from right, was 6 years old when her mother was diagnosed with breast cancer.

When I was 11, my father died. I didn’t know anyone my age who had lost a parent. I thought that only people who were my parents’ age lost a parent.

I certainly didn’t know Kate Atwood then, but I’m happy to know her now. Atwood’s mom died from breast cancer when she was 12. Atwood saw the need for an organization to bring bereaved children together to let them know they’re not alone.

In 2003, she started Kate’s Club, a group that empowers kids after the loss of a parent or sibling. Social, recreational and emotional support programs help them cope with their loss and remember that even though they just had to grow up fast, they’re still kids at heart.

Update: Watch the CNN.com Live interview