I'll explain it to you app for iPhone and iPad

"Ill explain it to you (Te lo spiego io), is a project aimed at families, children and teenagers from 0 to 14 years old, created by the paediatric oncology department of the Milan Cancer Institution and the Italian League for the Fight Against Cancer, published by Centro Leonardo Education.
The projects aims to support families and children during the course of treatment and to help the children to acquire new skills that they can use at school and with friends.
The project is made up of an interactive eBook containing video clips filmed here, along with numerous educational games and interactive learning tools for children aged from 0 to 14 years.
The eBook is published in seven languages (Italian, English, French, Spanish, Romanian, Arabic and Chinese)."