When it comes to after school activities, Rebecca and Kimberly Yeung may be some of the most motivated students in America. At 11 and 9 years old, these sisters took their interests in science and technology and launched a space program with weather balloons to gather data about our climate. After their first launch successfully climbed to 78,000 feet, President Obama caught wind of their work and invited them to the White House Science Fair. Perhaps even the sky is no limit for these young scientists.
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