Two-dimensional (2D) shapes are completely flat. They have two dimensions – length and width. A polygon is a closed 2D shape with straight sides that meet at vertices. Polygons can be regular or ...

The scale invariance in branch diameter dictates how much smaller a limb should be as it branches and how much investment a ...

August, for example, is orange, quite long and evenly shaped, while September is light blue and bends round a corner.

This clip is from the series Hunting for History. Suitable for: History at KS3 in England Wales and Northern Ireland and 3rd and 4th level People, past events and societies in Scotland.

Two-dimensional materials are substances with a thickness of a few nanometres or less. Electrons in these materials are free to move in the two-dimensional plane, but their restricted motion in ...

Tanner stages are a tool used by healthcare providers to evaluate development in puberty. They detail five specific stages of physical change in puberty, including genital, breast, and pubic hair ...