For Caroline and Isabel Bercaw, it was when they were 10 and 11 years old. During the summer of 2011, their parents picked up $25 worth of ingredients to make homemade bath bombs as a science experiment. Little did their parents know that they were making a business investment that would turn into a multi-million dollar business. Caroline and Isabel decided to make enough to sell at a local art fair near their home in Minneapolis. After three months of trial and error, they made about 150 bath bombs. When the art fair arrived, they sold their entire stock the first day. Today Caroline and Isabel's parents have quit their day jobs to run DaBomb Fizzers, a company that they say sells 500,000 bath bombs a month and employs more than 100 people. Each bath bomb has a surprise inside such as charms or coins and can be found at stores such as Target and Ulta.