NBC News reports that Bella Lin of San Francisco was 12, she noticed that her pet guinea pigs kept disappearing from her backyard. She was unsatisfied with traditional "prison-barred" cages, so she decided to design and build her own.
The result is the GuineaLoft system. The cages have 2-tiered bottoms to make them easier to clean, as well as transparent plastic walls that snap together to make them easy move and see through.
Lin scrounged up $2,000 of her own money to launch this business and sell her cages on Amazon. Last year, she earned $410,000 from the business.
Lin is reinvesting all of her earnings into the company while applying to colleges and planning on a trip to the factory in China that manufactures her cages. This is only the beginning of her entrepreneurial ventures.
-via Debby Witt