Ακολουθεί βιντεάκι από το κεφ. 5 της Ιστορίας
http://www.slideboom.com/presentations/811776/%CE%99%CF%83%CF%84%CE%BF%CF%81%CE%AF%CE%B1-%CE%94%CE%84-%CE%9A%CE%B5%CF%86.-5---%CE%9F%CE%B9-%CE%BD%CE%AD%CE%B5%CF%82-%CE%B1%CF%80%CE%BF%CE%B9%CE%BA%CE%AF%CE%B5%CF%82-%CF%84%CF%89%CE%BD-%CE%95%CE%BB%CE%BB%CE%AE%CE%BD%CF%89%CE%BD
http://www.slideboom.com/presentations/811776/%CE%99%CF%83%CF%84%CE%BF%CF%81%CE%AF%CE%B1-%CE%94%CE%84-%CE%9A%CE%B5%CF%86.-5---%CE%9F%CE%B9-%CE%BD%CE%AD%CE%B5%CF%82-%CE%B1%CF%80%CE%BF%CE%B9%CE%BA%CE%AF%CE%B5%CF%82-%CF%84%CF%89%CE%BD-%CE%95%CE%BB%CE%BB%CE%AE%CE%BD%CF%89%CE%BD
