Meet LEGO's first professional girlsBy CNN StaffUpdated 10:57 AM ET, Tue August 19, 2014Just WatchedLEGO's all-female scientist toy setreplayMore Videos ...LEGO's all-female scientist toy set 02:01Story highlightsLEGO's new set of figures called Research Institute sold out worldwide within a few daysIt features female scientist, an astronomer and a palaeontologist complete with a dinosaurPrevious sets targeted at girls lacked professional female charactersWhen LEGO released a set of figures collectively called the Research Institute -- featuring a scientist, astronomer and a palaeontologist -- it sold out worldwide within a few days. Why the fuss about a few tiny plastic people? Because they are all female professionals. Previously, LEGO fans could only create professional females by building them out of existing parts. The only female figures supplied by LEGO fed into traditional stereotypes: Women hanging around the house, going to the beach or playing with pets.But then in January seven year old Charlotte Benjamin penned a letter that went viral, criticizing the company for the lack of professional female LEGO figures.Lego ladies take on science 6 photosLego ladies take on science 6 photosLego ladies take on science – Lego released a new set of figures called the Research Institute. It features a female scientist, an astronomer and a palaeontologist.Hide Caption 1 of 6Lego ladies take on science 6 photosLego ladies take on science – The new Lego playset was sold out within a few days. Pictured here is a figure from the set -- a female chemist.Hide Caption 2 of 6Lego ladies take on science 6 photosLego ladies take on science – Another character in the new Lego set is a female astronomer. Hide Caption 3 of 6Lego ladies take on science 6 photosLego ladies take on science – Lego's previous Friends sets, released in 2011, also targeted girls. They featured everything from a bakery to a pet salon and a juice bar.Hide Caption 4 of 6Lego ladies take on science 6 photosLego ladies take on science – But the previous Lego sets targeted at girls lacked professional female characters.Hide Caption 5 of 6Lego ladies take on science 6 photosLego ladies take on science – The Lego Friends series featured figures that stayed around the house or went to the beach or the pet shop.Hide Caption 6 of 6EXPAND GALLERYJust WatchedPaid to play with LegosreplayMore Videos ...Paid to play with Legos 03:07PLAY VIDEOJust WatchedIs Lego nipping at Disney's heels? replayMore Videos ...Is Lego nipping at Disney's heels? 03:16PLAY VIDEO"All the girls did was sit at home, go to the beach, and shop, and they had no jobs but the boys went on adventures, worked, saved people, and had jobs, even swam with sharks," she wrote. This month, Charlotte got her researchers -- although LEGO said it was already developing the new female figures at the time of the letter.Scientist Ellen Koojiman first submitted the idea for all-female LEGO set to the company's website on 2012. She managed to get 10,000 supporters for her proposal, which was eventually turned into the new product by LEGO. "As a female scientist I had noticed two things about the available LEGO sets: a skewed male/female minifigure ratio and a rather stereotypical representation of the available female figures," she wrote in the pitch.LEGO is now the world's top toy maker, after overtaking Mattel, the maker of Barbie. Its chief executive, Jorgen Vig Knudstorp, told CNN the company wants to expand in Asia and was eyeing markets such as China. "The idea of the LEGO brand resonates really well with the Chinese consumers," Knudstorp said."They are highly focused on creativity, learning, education, and at the same time recognize that learning trough play is a unique way of learning, which is in many ways much more powerful," he added.LEGO has targeted the female market before, with its LEGO Friends set designed for young girls released in December 2011. 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