Symmetry is when one side of a shape is a mirror image of the other side. Lots of buildings and everyday objects use symmetry because it looks appealing to the human eye. Watch the video below ...

A 2D shape is symmetrical if a line can be drawn through it so that either side of the line looks exactly the same. The line is called a line of symmetry. This is sometimes called a 'mirror line ...

Symmetric Li-ion cells have the same material as the positive and negative electrode (when cells are assembled one would already contain lithium and the other wouldn’t). Although the cells have an ...