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Gemma Stekelenburg is an illustrator and developer of animations and e-learning software. She started as an illustrator of biology books, and learned to work with many graphics programs such as Illustrator, Photoshop, Indesign, Animate and After Effects. During her studies (biology) she learned to program in Pascal. Today she uses mainly JavaScript, Dart, HTML, CSS, XML and PHP. She makes lessons for elementary, secondary and university education and infographics and illustrations for magazines and books.