This video will explain the way in which Greece became a direct democracy and the problems that the system created for the Greek people.

In this live-action program viewers will learn that taxonomists are scientists who work to classify organisms and place them into a complex tree of life. Students will come to understand that one of those classifications is kingdom...

Work through this practice GCSE / K12 question on atomic number, atomic mass and electronic configuration. Read the question, and hit pause if you want to try answering it yourself. Then hit play again to watch how the teacher solves it.