Portrait artist Gwenneth Barth demonstrates the medium of pastel, and shares tips and techniques on how to achieve the most out of your work.

• Setting the stage / Light
• Preliminary materials and drawing
• Values
• Pastel materials
• Colour
• Clothing and Background change
• Pastel organization
• Lost and found edges / Eyepaths / Centre of interest

All 12 episodes from the third series of the award-winning CBBC history series. Based on the best-selling series of children's books and liberally splattered with guts, blood and poo, the series offers an anarchic and unconventional take on some of history's most gruesome and funny moments, with topics including World War I, the Middle Ages, the Tudors and Stuarts, the Victorians and the Aztecs.

Collection of two special episodes from the award-winning CBBC history show. Based on the best-selling children's books the series offers an anarchic and unconventional take on some of history's most gruesome and funny moments. In this instalment the programmes look at the celebration of Valentine's Day throughout the centuries as well as some of the more unusual aspects of the First World War. The episodes are: 'Ridiculous Romance' and 'Frightful First World War'.

Volume six of the series that aims to provide a basic introduction to chemistry. This episode introduces the atomic theory of matter. The way in which atoms bond together to form compounds is at the heart of the atomic theory of matter, as are the law of conservation of mass and the law of multiple proportions.

Volume eight of the series that aims to provide a basic introduction to chemistry. This episode concludes the discussion of the atomic theory of matter. The way in which atoms bond together to form compounds is at the heart of the atomic theory of matter, as are the law of conservation of mass and the law of multiple proportions.

Volume 12 of the series that aims to provide a basic introduction to chemistry. This episode examines the topic of naming molecular compounds. The forces of nature which cause molecular compounds to form are outlined along with the method for naming the various compounds that arise.

Your child is never too young to start learning a second language. This animated film teaches children the names of the colours in Spanish, with help from Rufino the funny chameleon.