NARRATOR: This song is all about shapes. Not flat shapes like circles and squares, but solid shapes like cubes and cones. Let’s start with a cube. It’s difficult to make yourself into a cube ...

Polygons have names that show the number of sides they have. A three-dimensional (3D) shape is a solid shape. 3D shapes have three dimensions - length, width and depth. Look at the shapes of the ...

The study, recently published in Science, describes micro-robotic units that can switch from a "fluidizing" state to a more "solid" shape based on the rotational state of the robots. The idea is ...